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參考資料：各種平面圖形定義
多邊形：由數條線段所圍成的封閉圖形。(polygon:the union of several line segments that
are joined together so as to completely enclose an area.)
三角形：有三個邊的多邊形。(a
three sided polygon.)
四邊形：有四個邊的多邊形。(a
polygon with 4 sides.)
長方形：四個角都是直角的四邊形。(a
quadrilateral with four 90 degree angles.)
正方形：四個邊都一樣長且四個角都是直角的四邊形。
(a quadrilateral with four
equal sides and four 90 degree angles.)
圓形：有一個點,它到圖形邊上任何一點的距離都一樣，這樣的圖形就可以稱為圓形。
(the set of points in a
plane that are a fixed distance from a given point.)
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