名校
1 . 同学们在做题时,经常用到“在直角三角形中,
角所对的直角边等于斜边的一半”这个定理,下面是两种添加辅助线的证明方法,请你选择一种进行证明.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/5/38c16957-bc4d-4abd-a4ce-0bddbd3d3765.png?resizew=102)
已知在
中,
,求证:
.
法一:如图1,在
上取一点
,使得
,接
.
法二:如图2,延长
到
,使得
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/5/5648c980-e8b3-4480-8063-a9f692c24315.png?resizew=310)
图1 图2
你选择方法_______
证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/5/38c16957-bc4d-4abd-a4ce-0bddbd3d3765.png?resizew=102)
已知在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/655b4e453406dad357caf3faea5cbae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebe44ff9f829f6c034682572ad00e366.png)
法一:如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/feb67f27bcda7681b19239a199b4c4d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
法二:如图2,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a16dc02090b6e9263555061f14fbc8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/5/5648c980-e8b3-4480-8063-a9f692c24315.png?resizew=310)
图1 图2
你选择方法_______
证明:
您最近一年使用:0次
2024-03-03更新
|
73次组卷
|
8卷引用:2023年北京二中教育集团中考一模数学试卷
2023年北京二中教育集团中考一模数学试卷(已下线)第11讲 等边三角形的性质与判定定理-【暑假自学课】2023年新八年级数学暑假精品课(浙教版)(已下线)专题13 三角形及全等三角形(共35题)-学易金卷:5年(2019-2023)中考1年模拟数学真题分项汇编(北京专用)河南省许昌市禹州市2023-2024学年八年级上学期期中数学试题(已下线)浙江省金华市婺城区2023-2024学年九年级上学期期末数学试题北京景山学校2023-2024学年九年级下学期开学考试数学试题(已下线)专题06+全等三角形和特殊三角形(4大易错点分析)2-备战2024年中考数学考试易错题(浙江专用)北京市回民学校2023-2024学年九年级下学期月考数学试题
2 . 教材呈现:如图是华师版八年级上册数学教材第94页的部分内容.
定理证明:请根据教材中的分析,结合图①,写出“线段垂直平分线的性质定理”完整的证明过程.
定理应用:
(1)如图②,在
中,直线
、
分别是边
、
的垂直平分线,直线
、
交于点
,过点
作
于点
.求证:
.
(2)如图③,在
中,
,边
的垂直平分线交
于点
,边
的垂直平分线交
于点
.若
,
,则
的长为______.
2.线段垂直平分线 我们已经知道线段是轴对称图形,线段的垂直平分线是线段的对称轴,如图,直线 ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() 已知:如图, ![]() ![]() ![]() ![]() ![]() 求证: ![]() 分析:图中有两个直角三角形 ![]() ![]() ![]() 请写出完整的证明过程 ![]() |
定理应用:
(1)如图②,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efeccd375f7ee16b46cc1f5c22d1995f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d03a6074fa932d98728d6d61670aea7.png)
(2)如图③,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e918b70b02a73685e3c536c7f380e2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c0a25884b0f27d1370df921d952a79f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/3/49ae22a1-fd7e-44c1-a3b9-96e0befe9e73.png?resizew=364)
您最近一年使用:0次
3 . 小明在学习《直角三角形的性质》的过程中产生了一个猜想:“在直角三角形中,
角所对的直角边是斜边的一半.”并进行了如下的探究,请完善小明的探究过程.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/18/1d267ffa-a695-472c-8a7d-a70abbaa94d2.png?resizew=170)
(1)结合图形,将小明猜想的命题写成已知、求证:
已知:________________________________________.
求证:
.
(2)补全上述猜想的证明过程.
证明:作线段
的垂直平分线
,交
于点D,交
于点E,连接
.(在图中用尺规作图,并保留作图痕迹)
∵直线
是线段
的垂直平分线,
∴
.(________________________________)(填推理依据).
∴
.(________________________________)(填推理依据).
∵
,
∴
.
∵
中,
,
,
∴
.(________________________________)(填推理依据).
∴
.
∴
.
∵
,
,
∴
.
在
和
中,
,
∴
(________________________________)(填推理依据).
∴
,
∵直线DE是线段AB的垂直平分线,
∴
________.
∴
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/18/1d267ffa-a695-472c-8a7d-a70abbaa94d2.png?resizew=170)
(1)结合图形,将小明猜想的命题写成已知、求证:
已知:________________________________________.
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd1fe7660ee42b8d3a9c076b700ae59a.png)
(2)补全上述猜想的证明过程.
证明:作线段
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
∵直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c45087cde2d66377517a3fce5553b35.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7573369ec6e83fdcea41c3de93e5f406.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d3c9ce32b721995f355eea411340e3.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08f57b8380e1c9d059087e2bd121153f.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d3c9ce32b721995f355eea411340e3.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661b25962bb3cfc485e51f99e8e5a945.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13c10daf6b94091ccc96364935bf6f4e.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcb4c8934b3e1ebcd72b901db2464cce.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79fb061226b947595511ad5a3a994695.png)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb49df05f2e31d005735c3f14a21d30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efeb07c149df941da2bfde2b2d616d3.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e4f428b37c40951d638556678210de9.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fc13fe21e64d9b45614ed43be847904.png)
∵直线DE是线段AB的垂直平分线,
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37d8cdf01dc18ff3b8ecbb90a357a113.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd1fe7660ee42b8d3a9c076b700ae59a.png)
您最近一年使用:0次
4 . 阅读与思考:
下面是一位同学的数学学习笔记,请仔细阅读并完成相应任务.
任务:
(1)请你完成证明过程.
已知:如图1,在“筝形”
中,
,
.求证:
.
(2)写出筝形的一个判定方法(定义除外)(文字语言叙述).
(3)如图3,在
中,
,点D、E分别是边
上的动点,当四边形
为筝形时,
的度数为________.
下面是一位同学的数学学习笔记,请仔细阅读并完成相应任务.
用全等三角形研究“筝形” 研究几何图形,我们往往先给出这类图形的定义,再研究它的性质和判定方法.在人教版八年级上册数学教材P53的数学活动中有这样一段描述:如图,四边形
根据学习几何图形的经验,我对如图1的筝形 (1)研究图形的性质,就是探究图形的构成元素(边、角、对角线) 具有怎样的特征.通过观察、测量、折叠、证明等操作活动,我首先发现了这类“筝形”有一组对角相等,并进行了证明. 已知:如图1,在“筝形” ![]() ![]() ![]() 求证: ![]() 证明: 我还发现了这类“筝形”的其他性质: 如图2,① ![]() ![]() ![]() ![]() ![]()
(2)继性质探究后,我又从边、角、对角线性质的逆命题等角度进行探究,得到“筝形”的判定方法有… |
(1)请你完成证明过程.
已知:如图1,在“筝形”
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a651eb577dbada1f29590e558d6f9fa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4fd85cff10e8f192cfe0b0a8b2f4996.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/16/168dd319-b164-45e0-81e2-0c589c89b7d8.png?resizew=71)
(2)写出筝形的一个判定方法(定义除外)(文字语言叙述).
(3)如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f98a130bee5cc7e583574cae0bfc9ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ed1fce01430ae31294c29d626626f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1d70676406f26d339465fe3473c0c05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d3e081637bcea5368cc72370bae283b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/16/a616fb6e-5c12-4857-8bdd-2a23c93f029c.png?resizew=175)
您最近一年使用:0次
5 . 教材呈现:如图是华师版八年级上册数学教材第
页的部分内容.
定理证明:请根据教材中的分析,结合下图,写出“线段垂直平分线的性质定理”完整的证明过程.
(1)如下图,在
中,直线
分别是边
的垂直平分线,直线
交于点
,过点
作
于点
.求证:
.
中,
,边
的垂直平分线交
于点
,边
的垂直平分线交
于点
.若
,则
的长为_________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0538cad6b26c7238b90e664bb68c27c.png)
线段垂直平分线 我们已经知道线段是轴对称图形,线段的垂直平分线是线段的对称轴,如图,直线 ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() 已知:如图, ![]() ![]() ![]() ![]() 请写出完整的证明过程 ![]() 分析:图中有两个直角三角形 ![]() ![]() ![]() |
(1)如下图,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0877194ab8760f54c35527177b03ff93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/887721a843b2dc8e947cc42d09868e33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0877194ab8760f54c35527177b03ff93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efeccd375f7ee16b46cc1f5c22d1995f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d03a6074fa932d98728d6d61670aea7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed00c3eaf0b3c01489e188ba68cc03f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
您最近一年使用:0次
6 . 【问题背景】
如图,
是边长为6的等边三角形,点
为
上一动点,连接
的垂直平分线分别交
于
,连接
.
【尝试证明】
(1)如图1,若点
是线段
上的动点.
求证:①
;
②
.
【拓展升华】
(2)如图2,若点
是线段
延长线上的点,当
时,求
与
的面积之比.
如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/9ff016af723be023e1525ce85d69fe94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19409d6d120387b3bccd934c4911bb45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94165c5047e68e952df7a8dc6dc32fda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/468848d6778ba56ef340bde4ff84834d.png)
【尝试证明】
(1)如图1,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
求证:①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb54d2b5fdd80b981bcc4e0797cc9f62.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7752dd084ab0a30d8febec991587ad9d.png)
【拓展升华】
(2)如图2,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/714cc3707bba3bfdb56e251999be8592.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/276d0071f4fa02e931c31a1fc32d9618.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8289f505d2cfbec2a4264e14b18f946e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/21/c5eecd58-f90f-41be-8bf0-6d23aa44b9f9.png?resizew=262)
您最近一年使用:0次
7 . 课本再现:
(1)定理 直角三角形斜边上的中线等于斜边的一半.
中,
,
是
边上的中线.
求证:
.
证明:如图1,延长
到点
,使得
,连接
.
……
请把证明过程补充完整.
知识应用:
(2)如图2,在
中,
是
边上的高,
是
边上的中线,
是
的中点,连接
并延长交
于点
,连接
.求证:
.
(1)定理 直角三角形斜边上的中线等于斜边的一半.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c71622531dfa894f21b2da123d020d24.png)
证明:如图1,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0fa1aa5a7a5bb172ed4603f17c8b2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cf89cd1b2aa78def32c227659015e27.png)
……
请把证明过程补充完整.
知识应用:
(2)如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/403aed6c79c7c7fa36f462a418a2e617.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/953b741d481bb5d5536688d6d4c22962.png)
您最近一年使用:0次
8 . 已知
是线段
垂直平分线
上一动点,连接
,以
为边作等边三角形
,点
在直线
的右侧,连接
与直线
交于点
,连接
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/17/4ce59e0f-5a9e-4fe8-9cec-0d4a54acca2d.jpg?resizew=305)
(1)如图1,点
在线段
上.
①根据题意补全图1;②求证:
;
(2)如图2,点
在直线
的右侧,
,用等式表示线段
,
,
之间的数量关系,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.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/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.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/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/17/4ce59e0f-5a9e-4fe8-9cec-0d4a54acca2d.jpg?resizew=305)
(1)如图1,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
①根据题意补全图1;②求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8819becacf62829282c6f56d643d229.png)
(2)如图2,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d301ccaef53e0660460180d9ae6fb257.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
您最近一年使用:0次
9 . 学习了轴对称后,小璧和小山来到乡村振兴基地进行了实践性研究. 如图,要把一块三角形的土地均匀分给甲、乙、丙三家农户. 如果
,
,要使这三家农户所得土地的大小、形状都相同. 小山认为可以先作
的平分线交
于点
,然后再过点
作
边的垂线即可,小壁思考片刻后认为小山的方法复杂了,她还有更简洁的方法就可以做到——只需要作边
的垂直平分线一条辅助线即可办到. 请聪明的你根据小璧的思路完成以下作图与填空:
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/22/5a7f0d4a-d040-4a5d-85ea-c88086712207.png?resizew=308)
(1)用直尺和圆规作
的垂直平分线
交
于点
,垂足为点
.(只保留作图痕迹)
(2)已知:如图,
中,
,
,边
的垂直平分线
交
于点
,垂足为点
,连接
.
求证:
,
证明:
,
_________,
由作图可知
,
,
,
垂直平分
,
_________,
_________,
,
_________,
.
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a69550d878381f6e8fb436e88638f070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0769bbeb13bd66ee39f530417be0f92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/22/5a7f0d4a-d040-4a5d-85ea-c88086712207.png?resizew=308)
(1)用直尺和圆规作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
(2)已知:如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a69550d878381f6e8fb436e88638f070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0769bbeb13bd66ee39f530417be0f92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81ad56f6ea5a0b9c5563b847aca19e10.png)
证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44887be9e110c9d6e3f8b589af0ddbfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e918e78749b99a0d392c0a6c0af1ad5a.png)
由作图可知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f6d802f1872b89278793f31d4b020ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83210883723ae145fa9403938dc0d8ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc529cf55d35c9fa85c7741d9bdd2f00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1949518fc246fbd8426d08f701ade25d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e65f7589c63c09b848884975b55c073.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b59af2939a7ae844290b8274bb8f041.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93f42c924c1e90f4d73a747b493fc508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9082842bfd67dfd64911a1b135710807.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/818d503d627bb8496a261cd90c1f81d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3154668c0203d998d226011d7221d4a.png)
您最近一年使用:0次
10 . 如图,
是等边
外的一点,
,
,
,点
、
分别在
和
上.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/22/03599803-b3b6-4da0-843a-07f7f6298007.png?resizew=157)
(1)求证:
是
的垂直平分线
(2)若
平分
,
①证明:
平分
;
②求
的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9953b7b5c647641edbec4c2ab90a65f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bcf905f3910d9238a44ef647835b3d1.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/22/03599803-b3b6-4da0-843a-07f7f6298007.png?resizew=157)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea2ee75a234ac05a3225e49ddd8c5065.png)
①证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab17635a999236e8d2e35017a208d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7652fd5598a9eaa011726784cae56bc8.png)
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
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