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[几何] 四边形的外接椭圆中心

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hejoseph posted 2016-2-19 10:48 |Read mode
求证四边形的外接椭圆的中心在一双曲线上。

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original poster hejoseph posted 2016-2-20 09:22
四边形外接椭圆的中心的轨迹在一双曲线或相交直线上,四边形四边、两对角线、对角线的交点都在这个轨迹上,轨迹的中心是四边形对角线中点所称线段的中点。

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青青子衿 posted 2019-7-25 10:30
回复 2# hejoseph
原来何版主早就得出了结论
[几何] 过四定点的圆锥曲线的中心轨迹?

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hbghlyj posted 2021-6-1 14:16

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