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Concept

Regular Polygon

A regular polygon is a polygon whose sides and angles are all congruent.
An equilateral triangle and a square

Regular polygons with three sides are generally referred to as either equilateral or equiangular triangles. Regular polygons with four sides are called squares. Regular polygons with more than four sides do not typically have special names.

Regular pentagon with five congruent sides and regular octagon with eight congruent sides.

The greater the number of sides of a regular polygon, the more it resembles a circle. When a polygon is not regular, it is said to be an irregular polygon.

Irregular polygon with five sides and side lengths of 3, 2, 3.9, 2, and 6 units.
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