悠闲数学娱乐论坛(第2版)'s Archiver

hbghlyj 发表于 2018-10-15 00:00

又见五点共圆

圆内接五边形ABCDE,直线AB,CD;AB,DE...交于点F,G,H,I,J,△ADF,△BDG...的外接圆交于点K,L,M,N,P,求证:点K,L,M,N,P共圆

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