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A pentagon is a polygon with exactly $5$ sides:


Regular Pentagon

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

That is, a regular polygon with $5$ sides.

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


Also see

  • Results about pentagons can be found here.

Linguistic Note

The word pentagon derives from the Greek penta, meaning five, and gon, deriving from the Greek for corner.