[几何] A,B 是圆的对径点，CE,DE 是切线，BE 交圆于 F，BD,AC 交于 G，求证：FA 平分 ∠DFG

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zhiwen posted 2023-11-5 22:19 |Read mode

Last edited by hbghlyj 2023-11-5 15:25

如图，A,B为对径点， CE,DE圆O的切线
BD AC交于点G， BE交圆于点F

求证：∠DEG=2∠AFG（等价于FA平分∠DFG）
尽量用纯几何，谢谢

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