（幾何学）十角形
thập giác
十個の角をもつ多角形。十角形。
幾何学の試験で、生徒たちは十角形が十の等しい辺と十の等しい角を持つことを証明しなければならなかった。
In the geometry exam, students have to prove that the decagon has ten equal sides and ten equal angles.
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