如图1,在正方形
中,E是
上一点,F是
延长线上一点,且
.
;
(2)在图1中,若G在
上,且
,则
成立吗?为什么?
(3)运用(1)(2)解答中所积累的经验和知识,完成下题:
①如图2,在直角梯形
中,
,
,
,E是
上一点,且
,
,求
的长.
②如图3,在
中,
,
,
,
,则
的面积为____(直接写出结果,不需要写出计算过程)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/f40b3bf6b27f936e0747de92151a1f77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac679f877d3e3b3acef1f1f8e3654b4b.png)
(2)在图1中,若G在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/582592ceedb907f96469916fcb734c1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/545f475d07190898c0b54a90e9c32fec.png)
(3)运用(1)(2)解答中所积累的经验和知识,完成下题:
①如图2,在直角梯形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce0ea62186c4eb1c0b631029cd977887.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d9142db4dd2ef151bf3d4a63afb61e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f12ae85718067cbc3679dcd95509bd55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a1af32e267e35ef79bcb8df5d169283.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7cbfaec1d9dcaaf159b060163436113.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
②如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f81e24376a13d648c2ed0dc73bc710e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/714cc3707bba3bfdb56e251999be8592.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55c24a968c73e960698a572ab01e3698.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
13-14八年级下·江西宜春·期末 查看更多[11]
2013-2014学年江西省高安市八年级下学期期末考试数学试卷江苏省苏州市吴江区青云中学2020-2021学年八年级下学期3月月考数学试卷(已下线)专题17 正方形与45度角基本图-【微专题】2022-2023学年八年级数学下册常考点微专题提分精练(苏科版)(已下线)专题9.44 正方形中的45度模型(基础篇)(专项练习)-2022-2023学年八年级数学下册基础知识专项讲练(苏科版)(已下线)专题18.44 正方形中的45度模型(基础篇)(专项练习)-2022-2023学年八年级数学下册基础知识专项讲练(人教版)(已下线)重难点01 平行四边形(6种模型与解题方法)-【满分全攻略】2022-2023学年八年级数学下学期核心考点+重难点讲练与测试(苏科版)(已下线)专题5.19 正方形中的45度模型(基础篇)(专项练习)-2022-2023学年八年级数学下册基础知识专项讲练(浙教版)(已下线)重难点02平行四边形(6种模型与解题方法)-【满分全攻略】2022-2023学年八年级数学下学期核心考点+重难点讲练与测试(浙教版)广东省佛山市禅城区明德中英文学校2023-2024学年九年级上学期第一次月考数学试题(已下线)专题01 平行四边形(5种模型与解题方法)-【帮课堂】2023-2024学年八年级数学下册同步学与练(苏科版)(已下线)专题03平行四边形(考题猜想,5种模型与解题方法)-2023-2024学年八年级数学下学期期中考点大串讲(沪教版)
更新时间:2021-08-27 11:33:17
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解答题-证明题
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【推荐1】将两张完全相同的矩形纸片
,矩形纸片
按如图方式放置,
为重合的对角线,重叠部分为四边形
.
为菱形;
(2)若四边形
的面积为60,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2283590c7c41c5e9a294fa73bc549d63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9bed48e91a0aabfd0cff783a275fd20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9bed48e91a0aabfd0cff783a275fd20.png)
(2)若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9bed48e91a0aabfd0cff783a275fd20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267ace52b64e1e7dfc5211e033255b7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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【推荐2】如图,在Rt△ABC中,∠ACB=90°,CD⊥AB于D,AC=
,BD=4.
(1)求证:△ACD∽△ABC;
(2)求△ABC的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
(1)求证:△ACD∽△ABC;
(2)求△ABC的面积.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/10/70984ba9-e0dc-4d97-8659-3957253862f5.png?resizew=212)
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【推荐1】“玩转数学”实践活动,是一种非常有效的学习方式,我们一起来动手、动脑玩转数学吧.如图①,折一折:将正方形纸片
折叠,使边
,
都落在对角线
上,展开得折痕
,
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/26/bf72f30a-d15c-4780-8c16-0825605789ed.jpg?resizew=270)
(1)
_______°;
转一转:如图②,将图①中的
绕点A旋转,使它的两边分别交边
,
于点P,Q,连接
.
(2)猜想线段
、
、
之间的数量关系,并说明理由;
(3)若正方形的边长为6,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/26/bf72f30a-d15c-4780-8c16-0825605789ed.jpg?resizew=270)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e569f82eb96d237501ed0fba536e9ac4.png)
转一转:如图②,将图①中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e31edc5b71c488ca9942d70d9298f01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
(2)猜想线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3525ddc5153fada64eaf14e50b536542.png)
(3)若正方形的边长为6,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54b7ddeaf0a0ed481573cb15a7c79a6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
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【推荐2】综合实践:在一节综合实践课上,数学老师要求同学们动手折叠一张正方形纸片,如图,点M是边
的中点,点P、Q是
边上的两个动点,连接
、
,将
折叠,使点A落在线段
上的点
处,
是折痕,将
折叠,使点B落在线段
上的点.
处,
是折痕.
①线段
与线段
的位置关系是: ;
②请说明:
;
(2)如图2,当点P在点Q的左侧时,若
,求
的度数;
(3)若
,直接写出
的度数为 .(用含α的代数式表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f2b7f63f07b00047cbb272fb1f77f60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db8305c4ffbf876642440c3d28e91e9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2273ae1ee99cec9c1304323bc9ebf75f.png)
①线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2273ae1ee99cec9c1304323bc9ebf75f.png)
②请说明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eb40c707a963241b02d002399905b3d.png)
(2)如图2,当点P在点Q的左侧时,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/620b0823a19119334640f047bed68b5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b89403a4db68423b83136d2cbff6225.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/438ebf719421e8d2187ac41d5d546984.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b89403a4db68423b83136d2cbff6225.png)
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【推荐1】正方形
的对角线交点为
,连
交
于
,交
于
,
,求证:
平分
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c68e3d6a5026f91ae6249e64d6863ba2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://img.xkw.com/dksih/QBM/2019/12/19/2358579916111872/2358627520143360/STEM/377d836d94c74632a8a5ad2acc84cf46.png?resizew=168)
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【推荐2】如图,已知△ABC是等腰直角三角形,∠BAC=90°,点D是BC的中点.作正方形DEFG,使点A、C分别在边DG和DE上,连接AE,BG.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/10/984c396f-f5e5-4040-a37f-25d8d7063ada.png?resizew=446)
(1)猜想线段BG和AE的数量关系是 ;
(2)将正方形DEFG绕点D逆时针方向旋转α(0°<α≤360°).判断(1)中的结论是否仍然成立?请利用图(2)证明你的结论;
(3)在(2)的条件下,若BC=DE=8,当AE=AG时,直接写出AF= .
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/10/984c396f-f5e5-4040-a37f-25d8d7063ada.png?resizew=446)
(1)猜想线段BG和AE的数量关系是 ;
(2)将正方形DEFG绕点D逆时针方向旋转α(0°<α≤360°).判断(1)中的结论是否仍然成立?请利用图(2)证明你的结论;
(3)在(2)的条件下,若BC=DE=8,当AE=AG时,直接写出AF= .
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