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正四面体
→△ABCは正三角形
→点Aから中点Mに向かって引くと垂直二等分線になり、△ABMは60°の直角三角形
→AM=2sin60°

シロ

めちゃわかりやすいです😭ありがとうございます!助かりました🙇‍♀️

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