Regular polygon is the actually the one which possesses the same size of its vertex angle as its edges with same length. All the regular polygons are associated with two perticular circles.
The first circle is known as the circumcircle, circle drawn close to the exterior of the polygon in order to touch all corners (or vertices). This circle is generally essential when creating a polygon.
Its radius emerges the following as} the CIRCUM radius.
The second circle is known as the incircle this is the circle driven within the polygon in order to touch all edges. Its dimension is given here from the IN radius.
Within this diagram, the CIRCUM circle is actually RED; the INcircle will be BLUE.
In the event the perimeter is required, the formula is number of edges x length of one edge