如图,⊙O是△ABC的外接圆,AB为直径,∠BAC的平行线交⊙O与点D,过点D的切线分别交AB、AC的延长线与点E、F.
![](https://img.xkw.com/dksih/QBM/2013/8/15/1573677134233600/1573677140377600/STEM/f52efaf1da1444be93ac80bdb5ae42c8.png)
(1)求证:AF⊥EF.
(2)小强同学通过探究发现:AF+CF=AB,请你帮忙小强同学证明这一结论.
![](https://img.xkw.com/dksih/QBM/2013/8/15/1573677134233600/1573677140377600/STEM/f52efaf1da1444be93ac80bdb5ae42c8.png)
(1)求证:AF⊥EF.
(2)小强同学通过探究发现:AF+CF=AB,请你帮忙小强同学证明这一结论.
更新时间:2016-12-05 18:37:14
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