
好词典

源自希腊语 'poly-'(意为“多”)和 'gonia'(意为“角”),字面意思是“多角形”。
❶ 多边形,指由三条或更多直线段组成的封闭平面图形,每条线段称为边,边的交点称为顶点。
“A triangle is the simplest type of polygon with three sides.”
(三角形是最简单的多边形,有三条边。)
“The children drew colorful polygons in their art class.”
(孩子们在美术课上画了彩色的多边形。)
regular polygon — 正多边形,指所有边长相等且所有内角相等的多边形,如正方形、正五边形等。
“A square is a regular polygon with four equal sides and four right angles.”
(正方形是一种正多边形,有四条相等的边和四个直角。)
convex polygon — 凸多边形,指所有内角均小于180度的多边形,任意两点连线都在图形内部。
“All triangles are convex polygons because their angles are always less than 180 degrees.”
(所有三角形都是凸多边形,因为它们的角度总是小于180度。)