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[几何] 完全四线形直线运动

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hbghlyj Post time 2020-9-12 19:14 |Read mode

定点E,F,直线AE,AF分别交两条定直线(图中为红色)于D,C,直线CE,DF交于B,当A在直线上运动时,求证:B也在直线上运动

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Author| hbghlyj Post time 2024-3-27 07:00

wafen⛏️

$A\mapsto B$是射影变换

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