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[几何] 内心有关证明题

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星奔川骛 Posted 2025-4-29 22:52 |Read mode

Last edited by hbghlyj 2025-5-1 17:23三角形ABC的内心I，作ID垂直BC，ID交圆(BIC)于E，F,G是圆(BIC)上的点满足AFG共线，J为BC与EG的交点，证明：IJ⊥EF

内心, 鸡爪圆

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