已知椭圆与其蒙日圆,abcd为椭圆外切矩形(同时也是蒙日圆内切矩形),问切点弦ef是否平行对角线bd 知乎 Template




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tomski已知椭圆与其蒙日圆,abcd为椭圆外切矩形(同时也是蒙日圆内切矩形),问切点弦ef是否平行对角线bd 知乎 coloring