A triangle is a plane figure with three sides.
三角形是有三个边的平面图形。
A septilateral shape is a plane figure with seven sides.
七边形是在一个平面上有七个边。
A line segment forming part of the perimeter of a plane figure.
形成一个平面图形的边界的线段。
The area of an irregular plane figure can readily be obtained with this method.
采用该方法可以很容易地求解不规则平面图形的面积。
The area of an irregular plane figure can readily be obtained with this method.
采用该方法可以很容易地求解不规则平面图形的面积。
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