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[几何] 很丑四边形中求边:AB 垂直于AD，角C=60度，角AFC=2角ADB，ED=2DC

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isee Posted at 2023-1-24 20:21:24 |Read mode

Last edited by isee at 2023-1-24 20:27:00来自知乎提问：zhihu.com/question/448196523

一直没纯平几法，如图所示

AB 垂直于AD，角C=60度，角AFC=2角ADB，ED=2DC，若BE=1，AE=4，求证：BC=8.

平面几何, 四边形

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