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在平面几何中,我们把多边形或其它平面封闭图形所围的平面部分的大小,叫做这个平面图形的面积。为了度量一个平面图形的面积,我们首先要
In plane geometry, we call the size of the plane part enclosed by a polygon or other plane-closed figure as the area of this plane figure. In order to measure the area of a plane figure, we must first