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A regular polygon is a polygon which is both equilateral and equiangular.

That is, in which all the sides are the same length, and all the vertices have the same angle:


Also known as

In Euclid's The Elements, a regular polygon is referred to as an equilateral and equiangular polygon.


Specific instances of regular polygons with specific numbers of sides are as follows:

The term regular $n$-gon is usually used nowadays to specify a regular polygon with a specific number, that is $n$, sides.

The specific name is usually invoked only in order to draw attention to the fact that such a regular polygon has a particularly interesting set of properties.

Also see