1 . 如图1,
中,
,
,以
为直径的
恰好经过点
,延长
至
,使得
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/24/c020d6e5-6f0b-4fa1-bacf-4b7cddb7eafa.png?resizew=372)
(1)求
的半径;
(2)求证:
;
(3)如图2,在
上取点
,连接
并延长交
于点
,连接
交
于点
.
①当
时,求
的值;
②设
,
,求
关于
的函数表达式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3ad4c0ba3a6750537789844d0ec419d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b939af5ba06e279cce39396aaf0fae06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19a1bf64ba772922fe58b5322eb4bced.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/24/c020d6e5-6f0b-4fa1-bacf-4b7cddb7eafa.png?resizew=372)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4fd85cff10e8f192cfe0b0a8b2f4996.png)
(3)如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4635b3ba280ea836f37948e70f039103.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6e38e2ba34ff619ca2453c349356abb.png)
②设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8711eddf26d11fc974dfb6da4b640918.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e21bf3bb41f4648070c41f0f283945c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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3卷引用:浙江省宁波市鄞州区2022-2023学年九年级上学期期末检测数学试题
浙江省宁波市鄞州区2022-2023学年九年级上学期期末检测数学试题2023年浙江省温州市永嘉县实验中学九年级中考模拟数学试题(已下线)专题16 几何类压轴问题-学易金卷:2023年中考数学一模试题分项汇编(浙江专用)
名校
2 . 如图,正方形
中,
为
上一点,线段
的垂直平分线
交
于
,
为垂足,交正方形的两边于
、
,连接
,则下列结论:①
;②
;③
;④
,其中正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.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/6c8ffe24cf9f327aeb241225ab15ab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c41ec8e7b9c1c67507c2e6417b732d87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18403fcef48d82247ea20e2a10547026.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8f30b8d5cb031426c7fb249eba2b39e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fa1891b9686dd6e8f5bccb58259224c.png)
A.①②③ | B.①②④ | C.②③④ | D.①②③④ |
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5卷引用:18.2.3 正方形-2022-2023学年八年级数学下册《考点·题型·技巧》精讲与精练高分突破系列(人教版)
(已下线)18.2.3 正方形-2022-2023学年八年级数学下册《考点·题型·技巧》精讲与精练高分突破系列(人教版)(已下线)难点特训(四)选填压轴50道-【微专题】2022-2023学年八年级数学下册常考点微专题提分精练(人教版)湖南省株洲市天元区建宁实验中学2022-2023学年八年级下学期期中数学试题湖北省武汉市武昌区拼搏联盟2021-2022学年八年级下学期数学期中试题湖南省长沙市一中芙蓉中学2023-2024学年八年级下学期第一次月考数学试题
3 . 在
中,
,
为
延长线上一点,点
为线段
,
的垂直平分线的交点,连接
,
,
.
时,则
______°;
(2)当
时,
①如图2,连接
,判断
的形状,并证明;
②如图3,直线
与
交于点
,满足
.
为直线
上一动点.当
的值最大时,用等式表示
,
与
之间的数量关系为______,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d9142db4dd2ef151bf3d4a63afb61e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1642eec556eb252de9c1ab7bb5ca90b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10ad623f3a05ecdc27b3f3e0169669.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee2ef38925946da1145a68651da67da9.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57fdd2a3642716fcf5100011eb3ec88.png)
①如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c771a4feb150ad9cff8d70431c97eb17.png)
②如图3,直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4aca16e0d54ce693cdc494636598b70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3168c02d6206627d5b4385e57bd15636.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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16卷引用:1.3 线段的垂直平分线-2022-2023学年八年级数学下册《考点·题型·技巧》精讲与精练高分突破系列(北师大版)
(已下线)1.3 线段的垂直平分线-2022-2023学年八年级数学下册《考点·题型·技巧》精讲与精练高分突破系列(北师大版)(已下线)黄金卷5-【赢在中考·黄金8卷】备战2023年中考数学全真模拟卷(包头专用)(已下线)专题12.25 全等三角形几何模型(手拉手)(分层练习)(培优练)-2023-2024学年八年级数学上册基础知识专项突破讲与练(人教版)(已下线)专题1.25 全等三角形几何模型(手拉手)(分层练习)(培优练)-2023-2024学年八年级数学上册基础知识专项突破讲与练(苏科版)(已下线)专题04 全等三角形模型训练(6类经典模型+优选提升)-【好题汇编】备战2023-2024学年八年级数学上学期期中真题分类汇编(人教版)(已下线)12.4(培优课)全等中的手拉手模型(题型精讲精练)-【题型分类精粹】2023-2024学年八年级数学上学期期中期末复习讲练系列【考点闯关】(人教版)北京市海淀区2021-2022学年八年级上学期期末数学试题(已下线)北京市第四中学2021-2022学年九年级下学期数学开学测试试题(已下线)(山东青岛卷)2022年中考数学第二次模拟考试(已下线)专题12.25 三角形全等几何模型-手拉手模型(巩固篇)(专项练习)-2022-2023学年八年级数学上册基础知识专项讲练(人教版)广东省梅州市丰顺县汤坑镇第二中学2022—2023学年九年级上学期开学考试数学试卷(已下线)专题2.2 最值模型之将军饮马 专项讲练-2022-2023学年八年级数学上册重难题型全归纳及技巧提升专项精练(浙教版)(已下线)专题1.52 全等三角形几何模型-手拉手模型(巩固篇)(专项练习)-2022-2023学年八年级数学上册基础知识专项讲练(浙教版)新疆维吾尔自治区乌鲁木齐市天山区第十三中学2022-2023学年八年级上学期期末数学试题河北省保定市易县2022-2023学年八年级上学期期末考试数学试题广东省清远市英德市2023-2024学年八年级下学期期中数学试题
4 . 如图,
中,
,
,
,若点
从点
出发,以每秒
的速度沿折线
运动,设运动时间为
秒
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/1/c1485f94-20e5-4589-aafd-78e84f7d20f7.png?resizew=470)
(1)点
运动结束,运动时间
______;
(2)当点P到边
、
的距离相等时,求此时t的值;
(3)在点P运动过程中,是否存在t的值,使得
为等腰三角形,若存在,求出t的值,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45fed79f92e159959c609b775300bef3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67fa79283e769e44399dab522aeaaf71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2713679aa5f12e1d89d3a3d98b65212e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/498eff3b3f00d4a1a88e2866ce53679e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cea72e0c37257bcfd85a59ef8dd0f80.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/1/c1485f94-20e5-4589-aafd-78e84f7d20f7.png?resizew=470)
(1)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/825116eb345f5505ebc8c1cdb8a1f131.png)
(2)当点P到边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(3)在点P运动过程中,是否存在t的值,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/147de24f071e316b68fd2e78e3c84545.png)
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|
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4卷引用:专题1.31 三角形的证明(存在性问题)(培优篇)(专项练习)-2022-2023学年八年级数学下册基础知识专项讲练(北师大版)
(已下线)专题1.31 三角形的证明(存在性问题)(培优篇)(专项练习)-2022-2023学年八年级数学下册基础知识专项讲练(北师大版)江苏省扬州市高邮市部分学校2023-2024学年八年级上学期期中数学试题江苏省盐城市东台市2023-2024学年八年级上学期期中数学试题江苏扬州市江都区实验初级中学2022-2023学年八年级上学期期中数学试题
名校
5 . 如果一个三角形的一个内角等于另一个内角的2倍,我们称这样的三角形为倍角三角形,并称这两个角的公共边为底边.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/25/b3c888fd-d7ab-4646-8238-fe9a5726fde5.png?resizew=506)
例如:若△ABC中,∠A=2∠B,则△ABC为以边AB为底边的倍角三角形.
(1)已知△ABC为倍角三角形,且
.
①如图1,若BD为△ABC的角平分线,则图中相等的线段有______,图中相似三角形有______;
②如图2,若AC的中垂线交边BC于点E,连接AE,则图中等腰三角形有______.
问题解决
(2)如图3,现有一块梯形板材ABCD,
,∠A=90°,AB=48,BC=132,AD=68.工人师傅想用这块板材裁出一个△BCP型部件,使得点P在梯形ABCD的边上,且△BCP为以BC为底边的倍角三角形.工人师傅在这块板材上的作法如下:
①作BC的中垂线l交BC于点E;
②在BC上方的直线l上截取EF=33,连接CF并延长,交AD于点P;
③连接BP,得△BCP.
1)请问,若按上述作法,裁得的△BCP型部件是否符合要求?请证明你的想法.
2)是否存在其它满足要求的△BCP?若存在,请画出图形并求出CP的长;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/25/b3c888fd-d7ab-4646-8238-fe9a5726fde5.png?resizew=506)
例如:若△ABC中,∠A=2∠B,则△ABC为以边AB为底边的倍角三角形.
(1)已知△ABC为倍角三角形,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b150d26d4f4172e384fa027b74b7688.png)
①如图1,若BD为△ABC的角平分线,则图中相等的线段有______,图中相似三角形有______;
②如图2,若AC的中垂线交边BC于点E,连接AE,则图中等腰三角形有______.
问题解决
(2)如图3,现有一块梯形板材ABCD,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
①作BC的中垂线l交BC于点E;
②在BC上方的直线l上截取EF=33,连接CF并延长,交AD于点P;
③连接BP,得△BCP.
1)请问,若按上述作法,裁得的△BCP型部件是否符合要求?请证明你的想法.
2)是否存在其它满足要求的△BCP?若存在,请画出图形并求出CP的长;若不存在,请说明理由.
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解题方法
6 . 如图,在
中,
,
的面积为12,
的垂直平分线
交
于点F,若D为
边的中点,M为线段
上的一动点,则
周长的最小值为_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d089b421d2a68b155e77aa0aed66f62d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75a1219bc313db46b07bbd68600267a4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/8/dc34cf3d-10fb-429e-991c-3883a6b247df.png?resizew=162)
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2023-01-13更新
|
633次组卷
|
6卷引用:山东省德州市宁津县2022-2023学年八年级上学期期末数学试题
山东省德州市宁津县2022-2023学年八年级上学期期末数学试题(已下线)13.3(培优课)将军饮马模型(题型精讲精练)-【题型分类精粹】2023-2024学年八年级数学上学期期中期末复习讲练系列【考点闯关】(人教版)人教版2020年九年级中考数学重点模型7(已下线)模型七 利用两点之间线段最短求最值陕西省宝鸡市渭滨区2021-2022学年八年级下学期期末考试数学试题河南省驻马店市汝南县2022-2023学年八年级上学期期中数学试题
7 . 已知:如图,在
中,
,
,
,点
是
边的中点.点
是射线
上的一动点(点
不与点
重合),点
在
的延长线上,且
,
,垂足为点
,
交边
于点![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/13/76176027-1fe2-4e8e-b212-15c2b67c264d.png?resizew=122)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/13/399e8cea-cf38-4dad-a82a-0123d63a5f76.png?resizew=113)
(1)求证:
;
(2)当点
在线段
上时,设
,
,求
关于
的函数解析式,并指出函数的定义域;
(3)当
时,直接写出
的长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab926d89b65f26c12e3da73ef1e5cf68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad3f1d2807be6d574e04ca9c6e721b22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cb27447c815a8a495ba5bf7040e265d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce50eeb654ef50f36a582c785f273ecf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/13/76176027-1fe2-4e8e-b212-15c2b67c264d.png?resizew=122)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/13/399e8cea-cf38-4dad-a82a-0123d63a5f76.png?resizew=113)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6095bae4840bfa80f2468f94b2002d7b.png)
(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/768de10830626ca777f9b4cfa994a3e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e21bf3bb41f4648070c41f0f283945c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0761165f1176f3a5fe4f7b052832316d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
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8 . 已知,正方形
的边长为8,点P、G分别在射线
、边
上,连接
,点B关于
的对称点为Q,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/11/0ddf3e7b-1540-4019-a644-8292ccbce64b.png?resizew=448)
(1)如图1,取
的中点E、F,连接
,若点Q刚好落在线段
上,且点P在线段FC上,则
的度数不可能 是下列选项中的______;(填序号)
①45°,②59°,③72°
(2)如图2,当点Q落在
边上(不与点D重合)时,试判断点P是否一定在射线BC上点C的右侧,并说明理由;
(3)在(2)的条件下,
①当
时,求
的长;
②若线段
与
相交于点N,连接
,试探索点Q落在不同位置时,
的度数是否发生变化,若不变,求出
的度数;若变化,请说明理由.
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4505508b3e36db64a207dcdaf8eb22dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4505508b3e36db64a207dcdaf8eb22dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/11/0ddf3e7b-1540-4019-a644-8292ccbce64b.png?resizew=448)
(1)如图1,取
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ba48366317ebea1c9dd5e4e67e03092.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe82457b26bc0282d97107570204d3e.png)
①45°,②59°,③72°
(2)如图2,当点Q落在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(3)在(2)的条件下,
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2899e607479d8d1c47d954ae9ebb7144.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
②若线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b8b86a298b16126c94663d7093de27e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b8b86a298b16126c94663d7093de27e.png)
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9 . 在平面直角坐标系
中,对于点
和线段
,若线段
或
的垂直平分线与线段
有公共点,则称点
为线段
的融合点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/3/46b415e4-4dc0-40af-877d-e1b6f9971aa8.png?resizew=616)
(1)已知
,
,
①在点
,
,
中,线段
的融合点是______;
②若直线
上存在线段
的融合点,求
的取值范围;
(2)已知
的半径为4,
,
,直线
过点
,记线段
关于
的对称线段为
.若对于实数
,存在直线
,使得
上有
的融合点,直接写出
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/3/46b415e4-4dc0-40af-877d-e1b6f9971aa8.png?resizew=616)
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f880f02c51a46e883522368a40ed66df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91fc70dfc020212a962eb3b228e7b599.png)
①在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b20d1b17401f4237c0aa0476aca32c58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea0be41f42e0df1953798ed7d80739e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/144f14ef9dc32d1df16e31aa7b17a175.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
②若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4ff39dd1dfc9caf911ad0d11ba21d66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c240561788bc63f41a6703219fb66d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c90b06e853b68d1ed7035780272ffcdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f488ff101ef0a3f43769e46449fb767.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb0628cecbfc98d390e5447d52414e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb0628cecbfc98d390e5447d52414e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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10 . 康康同学在研究等边三角形,如图1,已知
是等边三角形,D为
边的中点,E为中线
上一点(E不可取A点,可取D点),点E关于直线
的对称点是点F.连接
,
,
.
②他发现E点在中线
上运动时,
是一种特殊三角形.
请你回答
是 三角形;
③利用图1证明这个结论.
(2)康康同学发现当E点在中线
上运动时,
的长度也有规律的变化.当
为最大值时,在图2中画出点F,并连接
与
交于点P.
①按要求画出图形;
②在
上存在一点Q,使
的值最小,猜想这最小值____________
(填>,<,=);
③证明②的结论.
(3)在边
上存在一点M,同时满足
的值最大且
的值最小,则此时
与
的数量关系是____________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
②他发现E点在中线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
请你回答
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
③利用图1证明这个结论.
(2)康康同学发现当E点在中线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a83458c4a91d9f50bda7590b59ed5436.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
①按要求画出图形;
②在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7daf1bd6cc2e6229afc02131d714f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
③证明②的结论.
(3)在边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c1aa4039c030724e1c3ed0abbb6e01d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdcc045537a282b7025ec298bc50a51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c884b508394b3ab50734b584d9ec783c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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