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歐幾里得幾何中,等邊多邊形是指每條都一樣長的多邊形。如果這個多邊形的也都相等,那麼它是一個正多邊形。等邊三邊形及等邊四邊形一定是凸多邊形,邊長超過四的等邊多邊形可能是凸多邊形,也可能是凹多邊形或是自相交的多邊形英語list of self-intersecting polygons

等邊三角形也會是正三角形。等邊四邊形即為菱形(其中也包括了正方形)。

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