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[几何] 每个三角形都是等边三角形的正投影

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hbghlyj posted 2024-4-8 23:06 |Read mode

Prove that every triangle is the orthogonal projection of an equilateral one
证明每个三角形都是等边三角形的正投影

如何证明呢？

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2025-7-23 14:27 GMT+8

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