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[几何] 分为四个对角线互相垂直的凸四边形.

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hbghlyj posted 2021-3-11 15:56 |Read mode
Last edited by hbghlyj 2022-4-25 19:44凸四边形ABCD中,P,Q,R,S是线段AB,BC,CD,DA上的点.若相交的线段PR,QS把四边形ABCD分为四个对角线互相垂直的凸四边形.证明:PQRS共圆.

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其妙 posted 2021-3-13 20:11

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