如图,在等边
中,点
是
边上一点,连接
,将线段
绕点
按顺时针方向旋转
后得到
,连接
、
.
(1)判断
是什么特殊的三角形并证明;
(2)求证:
平分
;
(3)若
,求
的值.
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/25/dc2e59b7-3cef-4907-92f7-3aea034ca4f0.png?resizew=183)
(1)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/060705794ef87cc71dac40c57f27b1d2.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc51e2b7dbe5fa1bf1ba40ae53e56be7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/557e510640bdf7bd9460d92dcd19b465.png)
22-23八年级下·广东佛山·期中 查看更多[2]
广东省佛山市第三中学初中部2022-2023学年八年级下期学期中数学试题(已下线)第3章 图形的平移与旋转(单元测试·基础卷)-2023-2024学年八年级数学下册基础知识专项突破讲与练(北师大版)
更新时间:2023-06-15 10:10:54
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相似题推荐
解答题-证明题
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【推荐1】如图,在
中,
,点D、E、F分别在
边上,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/8/a9ee9e83-0ebf-4bf1-b64c-3b1c78308073.png?resizew=95)
(1)求证:
是等腰三角形;
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7eb46a5e933ade764ceb56830867ea3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bbda8eae0f9844dfe6f47d62ce892da.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/8/a9ee9e83-0ebf-4bf1-b64c-3b1c78308073.png?resizew=95)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/958b45552f9fa1a60016483bd8246be9.png)
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【推荐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.
![](https://img.xkw.com/dksih/QBM/2022/2/9/2912602160979968/2922560982876160/STEM/57e7755e4e0f4394bf1d5b95056137f9.png?resizew=519)
请根据所给教材内容,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:
![](https://img.xkw.com/dksih/QBM/2022/2/9/2912602160979968/2922560982876160/STEM/0248ebe5237b4a9ab2584061c4e7ddae.png?resizew=524)
(1)如图②,在△ABC中,AB、AC的垂直平分线分别交BC于点D、E,垂足分别为M,N,已知△ADE的周长为22,则BC的长为 .
(2)如图③,在△ABC中,AB=AC,AD⊥BC,E、P分别是AB、AD上任意一点,若BC=6,AB=5,则BP+EP的最小值是 .
![](https://img.xkw.com/dksih/QBM/2022/2/9/2912602160979968/2922560982876160/STEM/57e7755e4e0f4394bf1d5b95056137f9.png?resizew=519)
请根据所给教材内容,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:
![](https://img.xkw.com/dksih/QBM/2022/2/9/2912602160979968/2922560982876160/STEM/0248ebe5237b4a9ab2584061c4e7ddae.png?resizew=524)
(1)如图②,在△ABC中,AB、AC的垂直平分线分别交BC于点D、E,垂足分别为M,N,已知△ADE的周长为22,则BC的长为 .
(2)如图③,在△ABC中,AB=AC,AD⊥BC,E、P分别是AB、AD上任意一点,若BC=6,AB=5,则BP+EP的最小值是 .
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【推荐2】已知:如图,在
中,
,D为
的中点,
,
,垂足分别为E,F,且
.求证:
(1)
(2)
是等边三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d276d0010fd458383ea3dd61415e1aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7faabc484ce3666706c1beffda4bcfe2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/11/003782c7-c004-4cb0-b51b-467ccb096272.png?resizew=119)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4354365ca0929f8a606ed0bf341e4ca.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐1】如图,在
中,
,若D是
边上任意一点,将
绕点A顺时针旋转得到
,点D的对应点为点E,连接
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bb961bd7db3adb76af2d4cedb611bd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a8b0d7e169313c2a2d5c278cf968b9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b59ff53d6cb6d9f7754a60e849156a6a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/4/621d667c-0a8f-4408-9b7a-03035ea43fa6.png?resizew=114)
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【推荐2】如图,在
中,
,
,
是
边上一点(点
与
,
不重合),连接
,将线段
绕点
按逆时针方向旋转
得到线段
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/19/cdfb3478-7770-4c60-8877-e9f27c0a5002.png?resizew=166)
(1)求证:
;
(2)当
时,求
的度数.
![](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/4b10134e7a46e6f6f7cb9d5e2371727d.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/19/cdfb3478-7770-4c60-8877-e9f27c0a5002.png?resizew=166)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc8c5a0011c9af0c81b06e0b9b6dee3c.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0b65ca62ce90b4879f58884e826c669.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b871a762469393cdd22f15aa49ebb8f9.png)
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【推荐1】如图,∠BAD=∠CAD,则AD是△ABC的角平分线,对吗?说明理由.
![](https://img.xkw.com/dksih/QBM/2018/2/12/1880562717745152/1882201184256000/STEM/430eebba48b44d7eab30fff10c3f9ef8.png?resizew=96)
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【推荐2】如图,AB∥CD,E是直线FD上的一点,∠ABC=140°,∠CDF=40°.
EF;
(2)连接BD,若BD
AE,∠BAE=110°,则BD是否平分∠ABC ?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
(2)连接BD,若BD
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
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