A triangle is a plane figure with three sides.

三角形是有三个边的平面图形。

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A septilateral shape is a plane figure with seven sides.

七边形是在一个平面上有七个边。

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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。

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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。

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