如图,在
中,边
的垂直平分线分别交
于点D,E.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/18/447523b0-7e76-4ccd-b156-b2475cbd925c.png?resizew=191)
(1)若
,求
的周长;
(2)若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0d54431bbb28ebd98db5c1dc6083a75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/18/447523b0-7e76-4ccd-b156-b2475cbd925c.png?resizew=191)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7788830ed1cb3b9c5988f70f43595f2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c48997d5505035f1decd2bb46f1d0f0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/146a63bac5ecd239f2696801e8eaa0b2.png)
更新时间:2023-12-18 21:34:49
|
相似题推荐
解答题-证明题
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【推荐1】已知:如图,在四边形
中,
,对角线
、
相交于点
,
在边
的延长线上,且
,
.
是平行四边形;
(2)连接
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d2530e7023b2345c651e8f53629ff1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.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/007ea6a65d194b83745a7f880255a92e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dc5de308b59bac09be51dc8684d9abb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5322a78b02c2bc387ea7dce3e9461974.png)
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【推荐2】如图,
,E是BC的延长线上的一点,
交
于点F,
,
(1)
;
(2)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fc16bf53f6b6a6a40c2ebb575956dda.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4fd85cff10e8f192cfe0b0a8b2f4996.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dfa223e7b272346649538457c976864.png)
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【推荐1】如图,
,
,
的垂直平分线
交
于点
,求:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/13/6597842d-7e7e-495c-b6d5-8db8a0683e3e.png?resizew=106)
(1)
的度数;
(2)若
的周长是
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eeb0c8df3d8c5260768c5e407b3583a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65c5840e0454fdec7d2158072c43b8db.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/13/6597842d-7e7e-495c-b6d5-8db8a0683e3e.png?resizew=106)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/246a86f34603eaf2e6a948681b831b0d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e78c013cb4fc61193b651072d5e15de4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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【推荐2】如图,在△ABC中,D是BC的中点,DE⊥AB于E,DF⊥AC于F,BE=CF.
![](https://img.xkw.com/dksih/QBM/2019/12/13/2354070126305280/2355770122698752/STEM/bbad95a5bc704137b06b3363562404e0.png?resizew=123)
(1)∠B=70°,求∠CAD的大小;
(2)连接EF,求证:AD垂直平分EF.
![](https://img.xkw.com/dksih/QBM/2019/12/13/2354070126305280/2355770122698752/STEM/bbad95a5bc704137b06b3363562404e0.png?resizew=123)
(1)∠B=70°,求∠CAD的大小;
(2)连接EF,求证:AD垂直平分EF.
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【推荐1】如图,点P为n边形内一点,连结PA、PB、PC.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/27/23771297-460a-4b3f-ad56-4ea2c86893f0.png?resizew=102)
(1)设n边形的内角和为W.请用含n的代数式表示W,并写出它的推理过程;
(2)若n边形是正六边形,
是等腰直角三角形,
,试求
的度数.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/27/23771297-460a-4b3f-ad56-4ea2c86893f0.png?resizew=102)
(1)设n边形的内角和为W.请用含n的代数式表示W,并写出它的推理过程;
(2)若n边形是正六边形,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ee3a785e7d6b0c5d93f548435dabb1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3df0ba997bb8f5b2f2a2b677391ebc22.png)
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