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[几何] 外接圆中点平行四边形证垂直

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hbghlyj posted 2024-11-4 01:16 |Read mode

已知P是△ABC中BA延长线上一点，且PA=AC，直线PC再次交△ABC的外接圆于D，E 是BC中点，点F满足FA//DE、FD//AE。求证: PF⊥BC。

平面几何, 外接圆

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original poster hbghlyj posted 2024-11-4 01:17

取弧AC中点

怎么证BGD',B'ED中心对称？

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