如图,⊙O中,弦AD∥BC,DA=DC,∠AOC=160°,则∠BCO等于( )
![](https://img.xkw.com/dksih/QBM/2019/1/9/2115059089973248/2167423445254144/STEM/b251ce41fa7641fe8e02fbd6ddb242b2.png?resizew=103)
![](https://img.xkw.com/dksih/QBM/2019/1/9/2115059089973248/2167423445254144/STEM/b251ce41fa7641fe8e02fbd6ddb242b2.png?resizew=103)
A.20° | B.30° | C.40° | D.50° |
更新时间:2019-03-30 07:37:21
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【推荐1】将一把直角三角尺和一把直尺按如图所示的位置放置.若
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,已知a∥b,小明把三角板的直角顶点放在直线b上,若∠1=35°,则∠2的度数为( )
![](https://img.xkw.com/dksih/QBM/2019/4/22/2187784715624448/2188799940878336/STEM/51f0479380dd414e9c5346e38fe7449a.png?resizew=122)
![](https://img.xkw.com/dksih/QBM/2019/4/22/2187784715624448/2188799940878336/STEM/51f0479380dd414e9c5346e38fe7449a.png?resizew=122)
A.65° | B.120° | C.125° | D.145° |
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【推荐2】如图,在
中,
,
垂直平分
,交
于点
,交
于点
,若
,则
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【推荐1】如图所示,⊙O中,弦AB,CD相交于P点,则下列结论正确的是( )
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A.PA•AB=PC•PB | B.PA•PB=PC•PD | C.PA•AB=PC•CD | D.PA:PB=PC:PD |
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【推荐2】下列三个命题:①圆既是轴对称图形又是中心对称图形;②平分弧的直径垂直于这条弦;③相等的圆心角所对的弧相等;④在同圆或等圆中,如果两条弧相等,那么它们所对的弦也相等.其中真命题是( )
A.①②④ | B.①②③ | C.③④ | D.①④ |
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