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[几何] 焦点的等角共轭点的垂足三角形的内心

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hbghlyj posted 2021-4-6 18:13 |Read mode

求助，这个如何证明？
P是椭圆的焦点.△ABC内接于椭圆且P在△ABC内部.P的等角共轭点Q的垂足△DEF的内心为I.求证QI∥长轴.

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2025-7-23 09:42 GMT+8

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