| 单词 | 平面图形 |
| 释义 | 〔planisphere〕A representation of a sphere or part of a sphere on a plane surface.平面球形图：在平面图形上对一个球或球的一部分的表示〔side〕A line bounding a plane figure.边线：限定一平面图形的线〔polygon〕A closed plane figure bounded by three or more line segments.多边形；多角形：由三条或更多的线段围成的一个封闭的平面图形〔planimeter〕An instrument that measures the area of a plane figure as a mechanically coupled pointer traverses the perimeter of the figure.测面仪：一种仪器，当机械连结的探针扫过平面图形的周线时能测出图形的面积〔lozenge〕A four-sided planar figure with a diamondlike shape; a rhombus that is not a square.菱形：钻石形状的四边平面图形；不是正方形的菱面体〔figure〕A triangle is a plane figure.三角形是平面图形〔quadrant〕The plane area bounded by such an arc and two perpendicular radii.四分之一圆，扇形体：由九十度弧与两条垂直的半径围成的平面图形 |
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