如图,AB是⊙O的弦,CD与⊙O相切于点A,若∠BAD=66°,则∠E等于_______ ;
![](https://img.xkw.com/dksih/QBM/2017/6/14/1708920243052544/1711810268938240/STEM/427d0730a3f342daaf72bc96f4ef4e89.png?resizew=168)
更新时间:2017-06-20 00:30:04
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【推荐1】AB是
的直径,点D在AB的延长线上,DC切
于C,若AB=2,
,则DC=_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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【推荐2】如图,
为
的直径,
为
上一点,连接
,
,
,
,连接
,点
在
边上(
),点
关于直线
的对称点为
,连接
与
边交于点
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.当
为直角三角形时,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a71a9d21f77e9535de152bb33f802bb.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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【推荐1】如图,在
中,D是边
上一点,以
为直径的
经过点A,且
是
的切线.若
,则
的长为_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐2】如图,
中,
,过点
作
的平行线交过点
的圆的切线于点
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db90c0feb35aa54464f1303be9118f37.png)
_____
.
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