如图,AB是⊙O的直径,弦AD平分∠BAC,过点D作DE⊥AC于E.
(1)求证:ED是⊙O的切线;
(2)若ED,AB的延长线相交于F,且AE=5,EF=12,求⊙O的半径.
(1)求证:ED是⊙O的切线;
(2)若ED,AB的延长线相交于F,且AE=5,EF=12,求⊙O的半径.
![](https://img.xkw.com/dksih/QBM/2021/12/12/2871065307652096/2872177563435008/STEM/1e027e2d-9158-4ee2-9d26-143c6bd3576b.png?resizew=156)
更新时间:2021-12-14 08:43:07
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【推荐1】如图,在
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