A regular polygon is a polygon which is equiangular (all angles are congruent) and equilateral (all sides have the same length).

Attributes:

• The sides are the straight line segments that make up the polygon.
• The vertex is a corner of the polygon. In any polygon, the number of sides and vertices are always equal.
• The center is the point inside a regular polygon that is equidistant from each vertex.
• The apothem of a regular polygon is the line from the center to the midpoint of a side.
• The radius is the distance from the center to any vertex.
• By definition, all sides are the same length, so the perimeter is simply the length of a side times the number of sides.
  
  
  Examples of regular polygons: