The perimeter of a geometric figure is defined as distance or length of the path of a two-dimensional shape. Now's let get all that technical talk out of the way. Simply put, to arrive at the perimeter of a figure, we add up all the lengths of the figure given to us. But you don't want to be adding all those numbers up! What if the figure's a circle?! CIRCLES HAVE NO SIDES! Exactly; which is why we have some cla**ic, easy-to-use formulas to be put to good use. Hereafter, perimeter of a figure will be referred to as P unless otherwise mentioned. 1. Perimeter of a Regular Polygon: Simply, a regular polygon has a number of well-defined sides that are each equal in length. Refer to the Polygons page for detailed information on polygons and their types. Therefore, perimeter of a regular polygon, P= ns