如图,半径为3的⊙A经过原点O和点C(0,2),B是y轴左侧⊙A优弧上一点,则sin∠OBC为( )
![](https://img.xkw.com/dksih/QBM/2018/6/25/1974784617250816/1976308972077057/STEM/f7fdc8860c204a1298c03db51e1e8c3c.png?resizew=128)
![](https://img.xkw.com/dksih/QBM/2018/6/25/1974784617250816/1976308972077057/STEM/f7fdc8860c204a1298c03db51e1e8c3c.png?resizew=128)
A.![]() | B.![]() | C.![]() | D.2![]() |
更新时间:2018-07-06 05:08:42
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【推荐1】如图,
是正方形
外一点,
,连接
,
,过点
作
于点
,交
于点
,连接
,交
于点
.以下结论:①
;②
;③
;④当
是
中点,
时,
.正确的有( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/4/8f6272ba-9955-4239-b54e-39f3fe033482.png?resizew=193)
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A.①②③ | B.①③④ | C.①②④ | D.②③④ |
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【推荐2】如图,已知
的半径为5,弦AB,CD所对的圆心角分别是
,
,若
与
互补,弦
,则弦CD的长为( )
![](https://img.xkw.com/dksih/QBM/2020/1/6/2371116502097920/2371896586821633/STEM/9dd6c34998db4a32afb24e3f13600817.png?resizew=138)
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A.6 | B.8 | C.![]() | D.5 |
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