如图,在⊙O中,
,∠B=70°,求∠C度数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5142949086fdc50bacd01b9ab9202320.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/17/1753653e-18f1-4d6f-878b-a32f81a4dc52.png?resizew=126)
更新时间:2022-10-14 09:57:14
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【推荐1】如图,专业救助船“沪救1”轮、“沪救2”轮分别位于A、B两处,同时测得事发地点C在A的南偏东60°且C在B的南偏东30°上.已知B在A的正东方向,且相距100里,请分别求出两艘船到达事发地点C的距离.(注:里是海程单位,相当于一海里.结果保留根号)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/20/77558e42-6e1f-4755-aa6a-1102a0f554a2.png?resizew=173)
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【推荐2】如图,在
中,
垂直平分
,分别交
、
于
、
,连接
,
平分
,交
于
,若
,
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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【推荐1】如图,四边形ABCD是⊙O内接四边形,对角线AC和BD相交于点E,已知
.
求证:AE=BE.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75582a86b2b09db7221f22c7fcb35362.png)
求证:AE=BE.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/8/861fd190-d417-4d49-9d67-efdf8c233c66.png?resizew=174)
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【推荐2】如图,
为
的直径,弦
于点E,连接
.
(1)求证:
;
(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5345f892125374809bcaaab5da8d3f5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/2/8313d814-09f4-4141-9f2c-27a41f4232fd.png?resizew=156)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca69fb811bcd5426a88a3dbc32d84f24.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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