如图,⊙O与直线l1相离,圆心O到直线l1的距离OB=2
,OA=4,将直线l1绕点A逆时针旋转30°后得到的直线l2刚好与⊙O相切于点C,则OC=( )
![](https://img.xkw.com/dksih/QBM/2019/6/6/2219634707456000/2223362514296832/STEM/894dcdd272294e35930f8d2db740c156.png?resizew=169)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://img.xkw.com/dksih/QBM/2019/6/6/2219634707456000/2223362514296832/STEM/894dcdd272294e35930f8d2db740c156.png?resizew=169)
A.1 | B.2 | C.3 | D.4 |
更新时间:2019-06-11 16:25:31
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【知识点】 切线的应用
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