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[几何] 三角形顶点关于其外心垂心连线对称点的有关问题

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zhiwen posted 2023-12-2 16:54 |Read mode

题图

题图

O、H是分别是三角形的外心与垂心
点A.P关于OH对称,且线段AP与BC有交点
在AB.AC上取E.F
满足 BE=PC, CF=PB
另作直线AP.OH的交点K
证明EK⊥FK

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Ly-lie posted 2023-12-2 21:25
这是那套几何100题的第二题还是第几题来着,我好久之前做的,好像是有$ A,B,P,C $共圆以及平行四边形$KBPC$,好像还得取几个中点,太久了实在记不清了(而且我也不想再做一遍

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hbghlyj posted 2025-6-9 10:28

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