Principle objective of this article is to Define and Discuss on Regular Polygons. Here briefly explain on Parts of a regular polygon. In a regular polygon, there is one level in its interior that is equidistant from its vertices. This point is called center of the regular polygon. In this article Figure 1, O is center of the regular polygon. The radius of the regular polygon is the segment that goes from center to any vertex on the regular polygon. Here also explain on the Perimeter with examples.