解答题-证明题 适中0.64 引用3 组卷661
如图,AB是圆O的直径,C,D是圆O上两点,AC与BD相交于点E,GC,GD是圆O的切线,点F在DG的延长线上,且
.求证:
(Ⅰ)D、E、C、F四点共圆; (Ⅱ)![](https://img.xkw.com/dksih/QBM/2013/8/30/1571334802751488/1571334808125440/STEM/27a75bc4eaa1470cbd90c3a339eaba96.png)
![](https://img.xkw.com/dksih/QBM/2013/8/30/1571334802751488/1571334808125440/STEM/09374958012448759d3a6343378d06c4.png)
![](https://img.xkw.com/dksih/QBM/2013/8/30/1571334802751488/1571334808125440/STEM/8b2d2c29bc3241be96d0c1461e73ab77.png)
(Ⅰ)D、E、C、F四点共圆; (Ⅱ)
![](https://img.xkw.com/dksih/QBM/2013/8/30/1571334802751488/1571334808125440/STEM/27a75bc4eaa1470cbd90c3a339eaba96.png)
![](https://img.xkw.com/dksih/QBM/2013/8/30/1571334802751488/1571334808125440/STEM/09374958012448759d3a6343378d06c4.png)
2013·河北唐山·三模
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