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[几何] 椭圆求证共圆

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hbghlyj Posted 2020-7-5 18:55 |Read mode

P为椭圆上一点，P在左、右准线上的投影为Q,R，$QF_1,RF_2$交于S，求证：$P、F_1、F_2、S$共圆

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kuing Posted 2020-7-5 19:05

应该交待清楚 F1 在左 F2 在右……或者配图……

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kuing Posted 2020-7-5 19:07

哈，一搜就找到了，见：forum.php?mod=viewthread&tid=6168

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