(选修4-1:几何证明选讲)如图,PB为△ABC外接圆O的切线,BD平分
,交圆O于D,C,D,P共线.若
,
,
,则圆
的半径是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/404fc19da3e4da41e9147e9f0ca64957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8915e8e775538d41debf1933102c6b86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f99f724bb3614b40d63b284abaa7993f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bec03e804f0cea1db5cde2aa185056a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/2015/6/15/1572122493845504/1572122499538944/STEM/6681d77159a146babcb660a06bb6b8c0.png?resizew=138)
更新时间:2016-12-03 13:54:19
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【知识点】 几何证明选讲
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【推荐1】如图:在梯形
中,
为线段
上的点,
为线段
上的点,且
.则
的面积为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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【推荐2】(几何证明选讲选做题)如图,在直角梯形ABCD中,DC∥AB,CB⊥AB,AB=AD=a,CD=
,点E,F分别为线段AB,CD的中点,则EF=_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/576833b76e9cad3b523f87132308df99.png)
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