规定:顶角相等且顶角顶点重合的两个等腰三角形互为“友好三角形”.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/27/dfd4d624-dd27-4ec6-97c2-12d92526cd51.png?resizew=387)
(1)如图①,在
与
中,
,
,当
、
、
满足什么条件时,
与
互为“友好三角形”:
(2)如图②,在四边形
中,
,
,
,求
的度数.
(3)如图③,在
与
互为“友好三角形”,
,
,
,
相交于点
,连
,求证:
平分
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/27/dfd4d624-dd27-4ec6-97c2-12d92526cd51.png?resizew=387)
(1)如图①,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d212c1709b8e72a055cf1b5381ef64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/060705794ef87cc71dac40c57f27b1d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
(2)如图②,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2ddd49625097d0a78df7170be4f882e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b648f6f2bcc33d4ab0d3925ffb9c5e16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0e47acfa0b0bde7dbb8d7f294f98185.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
(3)如图③,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d212c1709b8e72a055cf1b5381ef64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b66a5b7813e902306477f91f9f4084cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed2884b46c0b3b258154b393777e966a.png)
更新时间:2024-01-27 10:25:42
|
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【推荐1】计算:(1)45.4°+34°6′;
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解答题-证明题
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适中
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【推荐1】在
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(2)如图2,当点D在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d35adeb057595dd77b0e7cd8801183d4.png)
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解答题-证明题
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名校
【推荐2】如图,在
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/11/bac4ce44-c40d-456c-95a4-223e36c4a1cd.png?resizew=195)
(1)直接写出
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__________°;
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c3975d0e87ea5028d37444dca76b331.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ad98ad714864041a632ca949308e417.png)
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(1)直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7d19f963f7c803bcfcbb265ec6d4304.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4ea2f99b7326d71004ef9bd4f39d61.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b3597f66d735cd5c8e686132383d7ab.png)
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解答题-问答题
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【推荐1】已知:如图,在
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aa30a9ee227af2b387cf6e028c20d7d.png)
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解答题-证明题
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适中
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解答题-证明题
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适中
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【推荐1】如图,菱形
的对角线
、
相交于点
,过点
作
且
,连接
交
于点
,连接
、
.
(1)求证:四边形
为矩形;
(2)若菱形
的边长为
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5a6e2ab0a2c893dc495df33e5ee092d.png)
(2)若菱形
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解答题-证明题
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适中
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【推荐2】在△ABC中,AB=AC,BC=12,∠B=30°,AB的垂直平分线DE交BC边于点E,AC的垂直平分线MN交BC于点N.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/4/6ff38003-8119-4b88-84f9-d50c3eb7704b.png?resizew=256)
(1)求△AEN的周长;
(2)求证:BE=EN=NC.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/4/6ff38003-8119-4b88-84f9-d50c3eb7704b.png?resizew=256)
(1)求△AEN的周长;
(2)求证:BE=EN=NC.
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