The distance around a closed plane figure is called the perimeter. The perimeter of a figure can be calculated by adding together the lengths of each side.
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plane figure
Perimeter
a closed plane figure with 3 or more line segments is a polygon
If they are straight sides, then a polygon. Otherwise, simply "a closed plane figure with 3 or more sides".
Any closed figure that is not entirely composed of straight sides, such as an ellipse or a circle.