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[几何] A,B 是圆的对径点,PE,PF 是切线,PA 交圆于 C,EA,BF 交于 D,求证:CP 平分 ∠DCE

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zhiwen posted 2023-11-4 21:18 |Read mode
Last edited by hbghlyj 2023-11-5 15:12 214706ac8ahvamxieh7zjj.png
如图, A,B是圆的对径点,PE,PF是圆上的切线,交于点P.
延长PA交圆于点C,延长EA,BF交于点D
连结CE,CD
求证: CP平分∠DCE
尽量用纯几何方法解

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乌贼 posted 2023-11-4 22:47
Last edited by hbghlyj 2025-5-16 04:23先证AQOF共圆
后再证CDPE共圆,
31.png

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