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[几何] 相切圆束内心轨迹垂直线段

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hbghlyj Posted 2020-10-20 09:50 |Read mode

Last edited by hbghlyj 2022-11-21 13:49 360截图20150723001922687.jpg

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动圆O与定直线相切于定点T,点A,B在圆O外,过A,B作圆O的切线,交点为D,E,F,G,作ABD,ABE,ABF,ABG的内心I,J,K,L,求证,K,L的轨迹是过T的线段,I的轨迹是过T的线段,两条线段相垂直

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Author| hbghlyj Posted 2022-11-21 20:50

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