如图,已知圆心角∠AOB=100°,则圆周角∠ACB的度数为( )
![](https://img.xkw.com/dksih/QBM/2018/1/14/1860180653940736/1865001370329088/STEM/8e2a4ec1f78d4f709a65f290fb0bbe0b.png?resizew=120)
![](https://img.xkw.com/dksih/QBM/2018/1/14/1860180653940736/1865001370329088/STEM/8e2a4ec1f78d4f709a65f290fb0bbe0b.png?resizew=120)
A.100° | B.80° | C.50° | D.40° |
更新时间:2018-01-22 18:47:39
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【推荐1】如图,AB是⊙O的直径,弦CD丄AB,∠CAB=20°,则∠BOD等于( )
![](https://img.xkw.com/dksih/QBM/2019/1/15/2119320557715456/2122793174261761/STEM/cb60698442834b77b7b2147525933c79.png?resizew=98)
![](https://img.xkw.com/dksih/QBM/2019/1/15/2119320557715456/2122793174261761/STEM/cb60698442834b77b7b2147525933c79.png?resizew=98)
A.30° | B.40° | C.45° | D.50° |
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【推荐2】如图,AB是⊙O的直径,O为圆心,C是⊙O上的点,D是
上的点,若∠D=120°,则∠BOC的大小为( )
![](https://img.xkw.com/dksih/QBM/2020/12/11/2611631268880384/2618360558395392/STEM/14cc9c931a384deea5ba953daf4c2c95.png?resizew=122)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667349d99185bb045030b733352ff7fd.png)
![](https://img.xkw.com/dksih/QBM/2020/12/11/2611631268880384/2618360558395392/STEM/14cc9c931a384deea5ba953daf4c2c95.png?resizew=122)
A.60° | B.55° | C.58° | D.40° |
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