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[几何] 求证外接圆与直径的交点为定点

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hbghlyj posted 2020-6-6 23:54 |Read mode
椭圆的中心为C,过椭圆上两点A,B作切线交CB,CA于D,E,AD,BE交于O,△ODE的外接圆交AC于F,求证:点F与点B的选取无关
等面三面角.png
source:ApolloniusⅠ

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original poster hbghlyj posted 2020-7-5 12:26
对于双曲线和抛物线也成立,而且AF=焦参数

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力工 posted 2020-7-5 20:53
觉得极点极线,但学渣渣,回个应,快闪

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