真题
名校
1 . 问题提出:如图(1),
是菱形
边
上一点,
是等腰三角形,
,
交
于点
,探究
与
的数量关系.
(1)先将问题特殊化,如图(2),当
时,直接写出
的大小;
(2)再探究一般情形,如图(1),求
与
的数量关系.
问题拓展:
(3)将图(1)特殊化,如图(3),当
时,若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3767efa8adfb71001ad39df9560cbf6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/304a6ea732d4b10f2875b361bba4e738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2edcf11b341e3a4e2fdddb53648b36b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
(1)先将问题特殊化,如图(2),当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33ac762a2899a58faa0d3ab44f1281fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2edcf11b341e3a4e2fdddb53648b36b4.png)
(2)再探究一般情形,如图(1),求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2edcf11b341e3a4e2fdddb53648b36b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
问题拓展:
(3)将图(1)特殊化,如图(3),当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d03f73bec20b60bc7608972607f5a9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/046cbf69d44e71676f11e13f0f767251.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68f1e72cbc30ad5fca807664692ea30b.png)
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17卷引用:四川省达州市达川第四中学2023-2024学年九年级上学期10月月考数学试题
四川省达州市达川第四中学2023-2024学年九年级上学期10月月考数学试题2023年湖北省武汉市数学真题(已下线)专题13 解三角形与三角形全等-学易金卷:5年(2019-2023)中考1年模拟数学真题分项汇编(全国通用)福建省莆田市擢英中学2023-2024学年九年级上学期第一次月考(开学考试)数学试题(已下线)专题32图形的相似(优选真题60道)-学易金卷:三年(2021-2023)中考数学真题分项汇编【全国通用】(已下线)2023年湖北省中考数学真题变式题21-24题江苏省苏州市苏州工业园区东沙湖实验中学2023-2024学年九年级上学期开学考试数学试题23-相似三角形28.2.1解直角三角形(已下线)第5讲 探究题2024年湖北省中考一模数学试题(已下线)重难点02 相似三角形模型及其综合题综合训练(11大题型+满分技巧+限时分层检测)-2024年中考数学【热点·重点·难点】专练(全国通用)2024年山东省临沂市莒南县中考数学二模试题(已下线)专题10 三角形压轴题综合-2024年中考数学二轮热点题型归纳与变式演练(全国通用)山东省烟台市牟平区(五四制)2023-2024学年九年级下学期期中考试数学试题(已下线)题型02 相似三角形的应用-22024年宁夏回族自治区石嘴山市惠农区中考模拟数学试题
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2 . 华师版八年级下册数学教材第121页习题19.3第2小题及参考答案.
某数学兴趣小组在完成了以上解答后,决定对该问题进一步探究
(1)【问题探究】如图,在正方形ABCD中,点E、F、G、H分别在线段AB、BC、CD、DA上,且
.试猜想
的值,并证明你的猜想.
,
,点E、F、G、H分别在线段AB、BC、CD、DA上,且
.则
______.
,
,
,点E、F分别在线段AB、AD上,且
.求
的值.
2.如图,在正方形ABCD中,![]() ![]() 证明:设CE与DF交于点O, ∵四边形ABCD是正方形, ∴ ![]() ![]() ∴ ![]() ∵ ![]() ∴ ![]() ∴ ![]() ∴ ![]() ∴ ![]() ∴ ![]() |
(1)【问题探究】如图,在正方形ABCD中,点E、F、G、H分别在线段AB、BC、CD、DA上,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/846b1b49f05812b0761eb565062d32f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/885a273360456694a3d40a913f3df2fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa375c3888b332f24e7d0f9b9600c694.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/890aea25780f7ba34adb23e799808462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/846b1b49f05812b0761eb565062d32f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d852b8a7e7b287c0bae2ce10d3e6dc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2b377f22aafd3742ad860f77abaacef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6b670ec1599330f6af99c600404afcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ea624cb140001a7e9d7567903a29521.png)
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13卷引用:2022年四川省乐山市中考数学真题
2022年四川省乐山市中考数学真题(已下线)专题09 图形的平移、对称、旋转与相似-2022年中考数学真题分项汇编 (四川专用)(已下线)专题16 四边形压轴题-三年(2020-2022)中考数学真题分项汇编(四川专用)(已下线)2022年四川省乐山市中考数学真题变式汇编22-262023年四川省内江市第六中学九年级中考数学第一次模拟测试卷(已下线)专题18 相似三角形-学易金卷:三年(2021-2023)中考数学真题分项汇编(四川专用)(已下线)专题15 相似三角形-2022年中考数学真题分项汇编(全国通用)(第1期)(已下线)专题20 拓展探究问题-学易金卷:2023年中考数学一模试题分项汇编(全国通用)广东省深圳市布吉中学2022-2023学年九年级上学期期中数学试题河南省南阳市淅川县基础教育教学研究室2023-2024学年九年级上学期期中数学试题(已下线)专题5 回顾教材(已下线)第8讲 正方形(已下线)专题11 四边形压轴题综合-2024年中考数学二轮热点题型归纳与变式演练(全国通用)
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3 . 某校一数学兴趣小组在一次合作探究活动中,将两块大小不同的等腰直角三角形
和等腰直角三角形
,按如图1的方式摆放,
,随后保持
不动,将
绕点C按逆时针方向旋转
(
),连接
,
,延长
交
于点F,连接
.该数学兴趣小组进行如下探究,请你帮忙解答:
时,则
_____;
(2)【初步探究】如图3,当点E,F重合时,请直接写出
,
,
之间的数量关系:_________;
(3)【深入探究】如图4,当点E,F不重合时,(2)中的结论是否仍然成立?若成立,请给出推理过程;若不成立,请说明理由.
(4)【拓展延伸】如图5,在
与
中,
,若
,
(m为常数).保持
不动,将
绕点C按逆时针方向旋转
(
),连接
,
,延长
交
于点F,连接
,如图6.试探究
,
,
之间的数量关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10fc7991ea17d54ff5f4445ac5699463.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a78f1b109b3c6d2390f0afb8e2513d8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/708d48b595c17d4dccf9b4086d7e664e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14dbafa1565aa5fb728b1b6edc1f8a93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9251dff989f7d60db751b73033dee269.png)
(2)【初步探究】如图3,当点E,F重合时,请直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
(3)【深入探究】如图4,当点E,F不重合时,(2)中的结论是否仍然成立?若成立,请给出推理过程;若不成立,请说明理由.
(4)【拓展延伸】如图5,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc75953bf5dcfa4af308c34bf9952d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76bf6a1ddc40eca17f3d5ce18c00bacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1fd7458509752c375bb49bc58278481.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/708d48b595c17d4dccf9b4086d7e664e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
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2005次组卷
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20卷引用:2022年四川省达州市中考数学真题
2022年四川省达州市中考数学真题(已下线)专题09 图形的平移、对称、旋转与相似-2022年中考数学真题分项汇编 (四川专用)(已下线)专题14 相似三角形与全等三角形-三年(2020-2022)中考数学真题分项汇编(四川专用)(已下线)2022年四川省广元市中考数学变式题22-26(已下线)2022年四川省乐山市中考数学真题变式汇编22-26四川省达州市开江县永兴中学2022-2023学年九年级上学期11月月考数学试题(已下线)2022年四川省达州市中考数学真题变式题21-25题(已下线)专题23 几何综合-学易金卷:三年(2021-2023)中考数学真题分项汇编(四川专用)(已下线)专题17 图形变换(平移、旋转、对称)-2022年中考数学真题分项汇编(全国通用)(第1期)(已下线)专题4.54 《图形的相似》挑战综合(压轴)题分类专题(专项练习)-2022-2023学年九年级数学上册基础知识专项讲练(北师大版)(已下线)第30课 相似三角形(动态几何,坐标问题)-2022-2023学年九年级数学上册课后培优分级练(北师大版)江西省抚州市金溪县第一中学2022-2023学年九年级上学期第三次月考数学试题(已下线)专题27.49 《相似》挑战综合(压轴)题分类专题(专项练习)-2022-2023学年九年级数学下册基础知识专项讲练(人教版)(已下线)专题6.52 《图形的相似》挑战综合(压轴)题分类专题(专项练习)-2022-2023学年九年级数学下册基础知识专项讲练(苏科版)(已下线)第五节 图形的旋转与位似03综合测(已下线)黄金卷08(青岛专用)-【赢在中考·黄金8卷】备战2023年中考数学全真模拟卷江西省 抚州市 临川区江西省抚州市第一中学2023-2024年九年级上学期第二次月考数学试题2023年甘肃省平凉市初中毕业与高中招生数学模拟预测试题2024年山东省济南市天桥区九年级下学期中考一模数学模拟试题2024年山东省菏泽市鲁西新区中考三模数学试题
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4 . 如图,在矩形
中,
,点
是
边上一动点(点
不与
,
重合),连接
,以
为边在直线
的右侧作矩形
,使得矩形
矩形
,
交直线
于点
.
的运动过程中,
与
始终保持相似关系,请说明理由.
(2)【深入探究】若
,随着
点位置的变化,
点的位置随之发生变化,当
是线段
中点时,求
的值.
(3)【拓展延伸】连接
,
,当
是以
为腰的等腰三角形时,求
的值(用含
的代数式表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5c2dfe278dcbb58b0c5c2cbebafab27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e279ad372652147be73c8a834734df0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa1f3c649b1032b432f4bccf7caf7bad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b238947afe06e2fb5f2a98bde3bd0f01.png)
(2)【深入探究】若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc2d3df37e73a8abea815f37dbb3fff5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4953f64aead21c2a2e50a248d88c5a07.png)
(3)【拓展延伸】连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdae78f4d3b8d8213ac3ac9a9567eb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83f1f880e5ffbff036953acaca90c41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/378f75f81c44553787e0fa2f8a28c794.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83f1f880e5ffbff036953acaca90c41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4953f64aead21c2a2e50a248d88c5a07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
您最近一年使用:0次
2022-06-15更新
|
3696次组卷
|
24卷引用:2022年四川省成都市中考数学真题
2022年四川省成都市中考数学真题(已下线)专题09 图形的平移、对称、旋转与相似-2022年中考数学真题分项汇编 (四川专用)(已下线)专题16 四边形压轴题-三年(2020-2022)中考数学真题分项汇编(四川专用)(已下线)2022年四川省乐山市中考数学真题变式汇编22-26(已下线)2022年四川省自贡市中考数学变式题23-26(已下线)2022年四川省南充市中考数学真题变式题21-25题(已下线)2022年四川省达州市中考数学真题变式题21-25题(已下线)2022年四川省成都市中考数学真题变式题21-26题(已下线)难点05 相似三角形综合(与三角形综合,与四边形综合)-2024年中考数学【热点·重点·难点】专练(四川成都专用)(已下线)专题15 相似三角形-2022年中考数学真题分项汇编(全国通用)(第1期)(已下线)专题4.46 三角形相似与动点问题(巩固篇)(专项练习)-2022-2023学年九年级数学上册基础知识专项讲练(北师大版)(已下线)广西壮族自治区南宁市青秀区三美学校2022-2023学年九年级上学期期末数学试题(已下线)专题27.39 相似三角形与动点问题(巩固篇)(专项练习)-2022-2023学年九年级数学下册基础知识专项讲练(人教版)(已下线)专题28.19 锐角三角函数(挑战综合(压轴)题分类专题)(专项练习)-2022-2023学年九年级数学下册基础知识专项讲练(人教版)(已下线)专题1.21 直角三角形的边角关系(挑战综合(压轴)题分类专题)(专项练习)-2022-2023学年九年级数学下册基础知识专项讲练(北师大版)(已下线)专题7.19 锐角三角函数(挑战综合(压轴)题分类专题)(专项练习)-2022-2023学年九年级数学下册基础知识专项讲练(苏科版)(已下线)专题6.44 相似三角形与动点问题(巩固篇)(专项练习)-2022-2023学年九年级数学下册基础知识专项讲练(苏科版)(已下线)专题1.21 解直角三角形(挑战综合(压轴)题分类专题)(专项练习)-2022-2023学年九年级数学下册基础知识专项讲练(浙教版)2023年福建省福州市延安中学中考二检(期中)数学试题2023年福建省福州金山中学中考模拟数学试题2023年福建省福州市仓山区福州金山中学中考三模数学试题(已下线)2023年福建二模(几何综合)广东省深圳市龙岗区龙城高级中学(教育集团)龙城初级中学2023-2024学年九年级上学期月考数学试题2023年浙江省金衢十二校中考数学模拟预测题
解题方法
5 . 问题提出:
如图①所示,在矩形
和矩形
中,
,点A,O,D不在同一直线上,连接
.
是
的中线,那么
之间存在怎样的关系?
![](https://img.xkw.com/dksih/QBM/2022/1/3/2893508422623232/2950033456021504/STEM/91f30cbc-9209-4caa-9b8b-c04245202604.png?resizew=562)
(1)问题探究:先将问题特殊化,如图②所示,当
且
时,
的数量关系是________,位置关系是________.
(2)问题拓展:再探究一般情形如图③所示,当
,
时,证明(1)中的结论仍然成立.
(3)问题解决:回归图①所示,探究
之间存在怎样的关系(数量关系用k表示)?
如图①所示,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63e3fa43e765646223675ef9bbd6d2f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c10f93679abcee21bacd92c3b1552a0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c082328733a3a3ccd4f1fccd54b17d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c14dd6a3395dfbf4814fd4ea2570ad5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f32395bce0f32cf51671acddce256bc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/372629a8666de1e9bac3e7daadcac7b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/641e419dd2a29ed807ca667f7474bc9f.png)
![](https://img.xkw.com/dksih/QBM/2022/1/3/2893508422623232/2950033456021504/STEM/91f30cbc-9209-4caa-9b8b-c04245202604.png?resizew=562)
(1)问题探究:先将问题特殊化,如图②所示,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5095a28bb1b91bf6bed9e2cfbd76bb18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfd4678832abebbe835f3032d11f4e49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/641e419dd2a29ed807ca667f7474bc9f.png)
(2)问题拓展:再探究一般情形如图③所示,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5095a28bb1b91bf6bed9e2cfbd76bb18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a197634d92135ce29586ae7bd37c5fae.png)
(3)问题解决:回归图①所示,探究
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/641e419dd2a29ed807ca667f7474bc9f.png)
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6 . 【问题呈现】某学校的数学社团成员在学习时遇到这样一个题目:
如图1,在
中,
,AD平分
交BC于点D,点E在DC的延长线上,过E作
交AC的延长线于点F,当
时,试说明:
;
【方法探究】
社团成员在研究探讨后,提出了下面的思路:
在图1中,延长线段AD,交线段EF的延长线于点M,可以用AAS证明![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
,从而得到
…,
(1)请接着完成剩下的说理过程:
【方法运用】
(2)在图1中,若
,则线段AF、EF、AB之间的数量关系为______(用含k的式子表示,不需要证明);
(3)如图2,若
,
,
,
,求出BD的长;
【拓展提升】
(4)如图3,若
,连接AE,已知
,
,
,且
,则边EF的长=______.
如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abcb980da8e86b4cfd322616dc84fc6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c197d8b99f2eb7477947e53461b5d548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/967d93b6a912ff75cd4b47eb8b68a6b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/104b98175ec7fd6958b0d9db91077fc4.png)
【方法探究】
社团成员在研究探讨后,提出了下面的思路:
在图1中,延长线段AD,交线段EF的延长线于点M,可以用AAS证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61543a63c309c18fd52aa7ac6d6188d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e532d61573265aa07696c2add38333e.png)
(1)请接着完成剩下的说理过程:
【方法运用】
(2)在图1中,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a8c3d238bca387baf98ed3a556d7d0b.png)
(3)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16e0c5cb53fd85b7a23f0580df6bb49a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6a028fd5b281ef168702a803baca6e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21fe7f306533f388843ff62fa2b5251a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/662a9a633cdf3c5f19105025d69fc089.png)
【拓展提升】
(4)如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9baa6cd7ac4ef4b87eba7fd7b86b7b73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d649afbddd907f0dfec1420f02f82fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/496063320c49ad6d236b3b71494ed90b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/349bbccb3b443ace1ddbdcaf981f0536.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24a619ddd138a4329d3b58a59e98d7d6.png)
![](https://img.xkw.com/dksih/QBM/2022/4/29/2968651656527872/2973769745727488/STEM/8220b3ef-a63f-486a-95ee-72008bb29213.png?resizew=456)
您最近一年使用:0次
2022-05-06更新
|
175次组卷
|
3卷引用:2022年四川省达州市达川区九年级中考适应性考试(一诊)数学试题
名校
解题方法
7 . 【探究发现】
(1)如图①.已知四边形
是正方形,点E为
边上一点(不与端点重合).连接
,作点D关于直线
的对称点
,
的延长线与
的延长线交于点F,连接
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/4/78657dbd-60d2-4ae4-aa62-ac28c18560c2.png?resizew=532)
①小明探究发现:当点E在
上移动时,
,并给出如下不完整的证明过程,请帮他补充完整.
证明:延长
交
于点G.
②进一步探究发现,当点
与点F重合时,
的度数为________.
【类比迁移】
(2)如图②,四边形
为矩形,点E为
边上一点,连接
,作点D关于直线
的对称点
,
的延长线与
的延长线交于点F,连接
,
,
.当
,
,
时,求
的长;
【拓展应用】
(3)如图③,已知四边形
为菱形,
,点E为线段
上一动点,连接
,作点D关于直线
的对称点
,若
恰好落在菱形的边上(不与顶点重合),求
的长.
(1)如图①.已知四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b3bd5e6bc2a0a277d279bb01af9584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82b25f3ea33cc08b1e2a0d9c3a9dccaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32b435d7fc33860ae191f9111d880b40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f611f5bb08a66cae8fe411e59a1c08e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/4/78657dbd-60d2-4ae4-aa62-ac28c18560c2.png?resizew=532)
①小明探究发现:当点E在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32577dda778c0bd267c4ece7bfcacf76.png)
证明:延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
②进一步探究发现,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b3bd5e6bc2a0a277d279bb01af9584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f34868b311f1082fb003dec7f07cdfd2.png)
【类比迁移】
(2)如图②,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b3bd5e6bc2a0a277d279bb01af9584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82b25f3ea33cc08b1e2a0d9c3a9dccaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32b435d7fc33860ae191f9111d880b40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8ba89e83329983cfadbfcdda151aaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f611f5bb08a66cae8fe411e59a1c08e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e46562e866eb760487b101c250328335.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8ba89e83329983cfadbfcdda151aaa3.png)
【拓展应用】
(3)如图③,已知四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5c357951c3faadb56372f3c79805f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b3bd5e6bc2a0a277d279bb01af9584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b3bd5e6bc2a0a277d279bb01af9584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
您最近一年使用:0次
真题
解题方法
8 . 某数学兴趣小组在数学课外活动中,对多边形内两要互相垂直的线段做了如下探究:
【观察与猜想】
(1)如图1,在正方形
中,点
,
分别是
,
上的两点,连接
,
,
,则
的值为__________;
![](https://img.xkw.com/dksih/QBM/2021/6/21/2747998767603712/2748419003252736/STEM/c576b71f-59c5-4b0f-8ccf-9c95dabf474c.png)
(2)如图2,在矩形
中,
,
,点
是
上的一点,连接
,
,且
,则
的值为__________;
![](https://img.xkw.com/dksih/QBM/2021/6/21/2747998767603712/2748419003252736/STEM/da23abcb-b53a-42b2-88b3-9d9e77419af2.png)
【类比探究】
(3)如图3,在四边形
中,
,点
为
上一点,连接
,过点
作
的垂线交
的延长线于点
,交
的延长线于点
,求证:
;
![](https://img.xkw.com/dksih/QBM/2021/6/21/2747998767603712/2748419003252736/STEM/84396462-e021-4e7d-b8a1-badc271ffe6f.png)
【拓展延伸】
(4)如图4,在
中,
,
,
,将
沿
翻折,点
落在点
处得
,点
,
分别在边
,
上,连接
,
,且
.
![](https://img.xkw.com/dksih/QBM/2021/6/21/2747998767603712/2748419003252736/STEM/d9f4bdf6-b0aa-41da-8b1d-05002ab36add.png)
①求
的值;
②连接
,若
,直接写出
的长度.
【观察与猜想】
(1)如图1,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1f87b02b744534ae1ed700d21fcceb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ada5e380d6b5b2066e34497e5f0baf0.png)
![](https://img.xkw.com/dksih/QBM/2021/6/21/2747998767603712/2748419003252736/STEM/c576b71f-59c5-4b0f-8ccf-9c95dabf474c.png)
(2)如图2,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78c1e75eb744576c32eed3f9d20f9558.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e673ef2d48215ca84a48377f17d6df00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a45b04cc3e5adaeff6f9e01e29032803.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8775dcf60ad143bc59a58b000f374c56.png)
![](https://img.xkw.com/dksih/QBM/2021/6/21/2747998767603712/2748419003252736/STEM/da23abcb-b53a-42b2-88b3-9d9e77419af2.png)
【类比探究】
(3)如图3,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41aba1711910c6f533cc94319104f4fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccb545c1a90c841d0d25070cf62b64e3.png)
![](https://img.xkw.com/dksih/QBM/2021/6/21/2747998767603712/2748419003252736/STEM/84396462-e021-4e7d-b8a1-badc271ffe6f.png)
【拓展延伸】
(4)如图4,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f127f0bc607d4ace53a6c5157612e78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce0d7095ddd69d6ceaf1065b1bc2c79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a306417e43670260e4b68a928a22071f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53289e3083b05d556dd30197abc547ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db5e1441a49e782ff0ef46e776cde06a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c88a11128d8f44ccc4f3d1cfdd7a9291.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1f87b02b744534ae1ed700d21fcceb4.png)
![](https://img.xkw.com/dksih/QBM/2021/6/21/2747998767603712/2748419003252736/STEM/d9f4bdf6-b0aa-41da-8b1d-05002ab36add.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ada5e380d6b5b2066e34497e5f0baf0.png)
②连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1364213f546b37f8764ddcb59e36ae4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
您最近一年使用:0次
2021-06-22更新
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839次组卷
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6卷引用:四川省达州市2021年中考数学真题
四川省达州市2021年中考数学真题(已下线)专题16 四边形压轴题-三年(2020-2022)中考数学真题分项汇编(四川专用)(已下线)专题18 相似三角形-学易金卷:三年(2021-2023)中考数学真题分项汇编(四川专用)江苏省扬州市梅岭中学2021-2022学年九年级上学期12月月考数学试题江苏省盐城市东台市2021-2022学年九年级下学期3月月考数学试题(一模)(已下线)专题33 阅读理解探究题压轴题-备战2022年中考数学临考题号押题(全国通用)
名校
解题方法
9 . 某数学兴趣小组在数学课外活动中,对多边形内两条互相垂直的线段做了如下探究:
![](https://img.xkw.com/dksih/QBM/2021/12/15/2872997151080448/2873964417056768/STEM/eca2fde56a434d3396b0399bfb7adc64.png?resizew=385)
观察与猜想
(1)①如图1,在正方形
中,点
,
分别是
,
上的两点,连接
,
,
,则
的值为 ;
②如图2,在矩形
中,
,
,点
是
上的一点,连接
,
,且
,则
的值为 ;
类比探究
(2)如图3,在四边形
中,
,点
为
上一点,连接
,过点
作
的垂线交
的延长线于点
,交
的延长线于点
,求证:
;
![](https://img.xkw.com/dksih/QBM/2021/12/15/2872997151080448/2873964417056768/STEM/bf334c7c9c8e482884a60328341a5bad.png?resizew=502)
拓展延伸
(3)如图4,在
中,
,
,
,将
沿
翻折,点
落在点
处得
,点
,
分别在边
,
上,连接
,
,
.请问
是定值吗?若是求出其值,若不是说明理由;
![](https://img.xkw.com/dksih/QBM/2021/12/15/2872997151080448/2873964417056768/STEM/eca2fde56a434d3396b0399bfb7adc64.png?resizew=385)
观察与猜想
(1)①如图1,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1f87b02b744534ae1ed700d21fcceb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ada5e380d6b5b2066e34497e5f0baf0.png)
②如图2,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78c1e75eb744576c32eed3f9d20f9558.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e673ef2d48215ca84a48377f17d6df00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a45b04cc3e5adaeff6f9e01e29032803.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8775dcf60ad143bc59a58b000f374c56.png)
类比探究
(2)如图3,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41aba1711910c6f533cc94319104f4fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccb545c1a90c841d0d25070cf62b64e3.png)
![](https://img.xkw.com/dksih/QBM/2021/12/15/2872997151080448/2873964417056768/STEM/bf334c7c9c8e482884a60328341a5bad.png?resizew=502)
拓展延伸
(3)如图4,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13ab0e3f4783faa57520f1f9dff63439.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce0d7095ddd69d6ceaf1065b1bc2c79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a306417e43670260e4b68a928a22071f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13ab0e3f4783faa57520f1f9dff63439.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73636989e83905f8800a865c2b608c43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1f87b02b744534ae1ed700d21fcceb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ada5e380d6b5b2066e34497e5f0baf0.png)
您最近一年使用:0次
名校
解题方法
10 . 如图1,已知点G在正方形ABCD的对角线AC上,GE⊥BC,垂足为点E,GF⊥CD,垂足为点F.
(1)证明:四边形CEGF是正方形;
(2)探究与证明:将正方形CEGF绕点C顺时针方向旋转α角(0°<α<45°),如图2所示,试探究线段AG与BE之间的数量关系,并说明理由;
(3)拓展与运用:正方形CEGF绕点C顺时针方向旋转α角(0°<α<45°),如图3所示,当B,E,F三点在一条直线上时,延长CG交AD于点H,若AG=9,GH=3
,求BC的长.
(1)证明:四边形CEGF是正方形;
(2)探究与证明:将正方形CEGF绕点C顺时针方向旋转α角(0°<α<45°),如图2所示,试探究线段AG与BE之间的数量关系,并说明理由;
(3)拓展与运用:正方形CEGF绕点C顺时针方向旋转α角(0°<α<45°),如图3所示,当B,E,F三点在一条直线上时,延长CG交AD于点H,若AG=9,GH=3
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://img.xkw.com/dksih/QBM/2021/11/26/2859401716604928/2859692373819392/STEM/e1c8cb6c-0290-4fb3-a45a-0511cf49a2ba.png)
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