如图⊙O是△ABC的外接圆,∠ACO=30°,则∠B的度数是( )
![](https://img.xkw.com/dksih/QBM/2017/3/19/1647225839419392/1660436087046144/STEM/6887cd17a12944f5bff1a6057458d6b0.png?resizew=147)
![](https://img.xkw.com/dksih/QBM/2017/3/19/1647225839419392/1660436087046144/STEM/6887cd17a12944f5bff1a6057458d6b0.png?resizew=147)
A.45° | B.50° | C.55° | D.60° |
更新时间:2017-04-07 08:28:46
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【推荐1】如图,已知CF垂直平分AB于点E,∠ACD=70°,则∠A的度数是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/12/a52c4de6-6fb1-4ebc-bf87-041a38875317.png?resizew=151)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/12/a52c4de6-6fb1-4ebc-bf87-041a38875317.png?resizew=151)
A.25° | B.35° | C.40° | D.45° |
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【推荐2】如图,将
绕点
顺时针旋转到
处,此时点
刚好落在
边上,若
,则旋转角的度数为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/25/e76e41ed-f646-49d7-b291-df514530d55f.png?resizew=82)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】如图,
是
的直径,
是
的弦,
于点E,连接
.若
,
,则
的半径的长为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a77e3c1c236141d6118429fade0a9b9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/807c14fd8900938264e4f6f0c5f26cbe.png)
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A.2 | B.![]() | C.4 | D.![]() |
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【推荐2】如图,
、
分别与
相切于
、
两点,点
为
上一点,连接,
、
,若
,
的度数为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/20/5fc7cd8b-097f-47d9-a228-8e915a96442a.png?resizew=174)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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