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[几何] 转载"踏雪"一几何题

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hbghlyj posted 2020-5-20 09:36 |Read mode
QQ图片20200518065647.jpg
记锐角$\triangle ABC$的外接圆为T,A-伪旁切圆、B-伪旁切圆、C-伪旁切圆分别
为$Γ_A、Γ_B、Γ_C$,圆心分别为U、V、W,$Γ,Γ_C,Γ_A$根心为P,$Γ_、Γ_C、Γ_A$的根心为Q,$Γ、Γ_A、Γ_B$的根心为R,$Γ_A、Γ_B、Γ_C$的根心为S。
证明: AP、 BQ、CR三线共点于K,且直线KS经过△UVW的外心O。

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