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[几何] 一道平面几何问题。如何用纯几何方法证明?

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TSC999 posted 2022-2-10 11:57 |Read mode
下图中的三角形可以是任意形状的三角形。要求用纯几何方法证明 N1N4N2N3 是平行四边形,并且它的对角线总有一条是平行于 OH 的。

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