(选修4-1:几何证明选讲)如图,已知直线
切圆
于点
,直线
交圆
于点
、
,若
,
,则圆
的半径长为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff8513b61617aa6b19ad2a764ee3aeae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f97e22c9dd88a2510de9e5a309191934.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e2868b617c871e18c928c9a573bc8c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bec08679eab52e3a0013abecdd1e6cc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f97e22c9dd88a2510de9e5a309191934.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49de2536004d4f0819e781fffca41a2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca66a268d6f46e0e9d5d9151b785be60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad4b3ac161685fc1c03f5591b3ccc1d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc17edc472b148dc491f978333d3bdee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f97e22c9dd88a2510de9e5a309191934.png)
![](https://img.xkw.com/dksih/QBM/2015/3/30/1572047081906176/1572047087263744/STEM/3226845ff076414f97aabeceed7ba595.png?resizew=160)
更新时间:2016-12-03 11:20:53
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【知识点】 几何证明选讲
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【推荐1】在△
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【推荐2】如图,PA是圆O的切线,切点为A,PO交圆O于B,C两点,
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