如图,
是
的角平分线,
,
分别是
和
的高.
求证:
(1)
;
(2)
垂直平分
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/6/bb992c89-4e36-4b3a-9ddc-6544bc34b88a.png?resizew=168)
求证:
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7faabc484ce3666706c1beffda4bcfe2.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
22-23八年级上·湖北恩施·期中 查看更多[2]
湖北省恩施市龙凤镇民族初级中学2022-2023学年八年级上学期期中数学试题(已下线)13.1 轴对称(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)
更新时间:2023-09-30 09:04:18
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解答题-证明题
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【推荐1】如图,我们将等腰三角形
对折,让两腰
、
重叠在一起,折痕为
,折叠的两个部分是互相重合的,两个底角也会完全重合,由此我们得到命题“等腰三角形的两个底角相等”
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/14/3f3916ac-0e8f-4d83-af50-aaa79e40ce58.png?resizew=129)
(1)请将此命题改写成“如果……,那么……”的形式:_____________.
(2)如下给出了不完整的“已知”和“求证”,请补充完整,并写出证明过程.
已知:如图,在
中,________.
求证:________________.
证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.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/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/14/3f3916ac-0e8f-4d83-af50-aaa79e40ce58.png?resizew=129)
(1)请将此命题改写成“如果……,那么……”的形式:_____________.
(2)如下给出了不完整的“已知”和“求证”,请补充完整,并写出证明过程.
已知:如图,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
求证:________________.
证明:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/14/32778be9-a709-4e36-90f8-59285d5b68f5.png?resizew=129)
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【推荐2】如图,在
中,D为
的中点,
于E,
于F,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2eb4c3c07f87ad98e96a354ae7f48a96.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/23/8feaf55d-ce59-4ff5-8ea9-d119a22384e5.png?resizew=95)
(1)求证:
;
(2)若
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a20e5d585fbf903ee5affa6d083ab95f.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/23/8feaf55d-ce59-4ff5-8ea9-d119a22384e5.png?resizew=95)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33ab55f098a96220c7f58460d0cc179a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76d46b5c9af0ede3ee5e2d7825896851.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
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【推荐1】如图,在△ABC中,
,
,
.
![](https://img.xkw.com/dksih/QBM/2021/12/18/2875105879547904/2877765569052672/STEM/c15b8174-c84a-46aa-99f5-1110dc0d0eaf.png?resizew=127)
(1)求证:△ABC是直角三角形;
(2)若AD平分∠BAC,求AD的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/addb8e20db1fbb40f17dea52f951b907.png)
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(1)求证:△ABC是直角三角形;
(2)若AD平分∠BAC,求AD的长.
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【推荐2】规定:如果一个三角形的三个角分别等于另一个三角形的三个角,那么称这两个三角形互为“等角三角形”.从三角形(不是等腰三角形)一个顶点引出一条射线与对边相交,顶点与交点之间的线段把这个三角形分割成两个小三角形,如果分得的两个小三角形中一个为等腰三角形,另一个与原来三角形是“等角三角形”,我们把这条线段叫做这个三角形的“等角分割线”
(1)如图1,在
中,
,请写出图中两对“等角三角形”.
(2)如图2,在
中,
为角平分线,
,求证:
为
的等角分割线.
(3)在
中,
是
的等角分割线,若
是等腰三角形,请求出
的度数.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/8/0ddb5716-e3a2-4d35-96ee-a5afbdc7a6fb.png?resizew=269)
(1)如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ddb186d607fa9f4b096ece9bff8e2eb.png)
(2)如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(3)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a118b1ea86b21975179b6b4d8616744f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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解答题-作图题
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【推荐1】如图,
,
.
(1)作出
的垂直平分线;
(2)证明作法是正确的.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe80c5f1fc28ab4a39c2197406bcffa1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/29/5cc84d4a-8d0e-4828-b091-51d44a73eec0.png?resizew=108)
(1)作出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)证明作法是正确的.
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【推荐2】如图,点E是
内的一点,
,连接
、
、
,且
,延长
交
边于点D.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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