四邊形
四邊形（Quadrilateral；tetragon），或者四角形（quadrangle）係有四條直邊嘅多邊形，總共有四隻角。
四邊形當中，跟據某啲特質，有特別叫法，例如梯形、正方形、長方形（矩形）、平行四邊形、鷂形、菱形。
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