Calculate from an regular 3-gon up to a regular 1000-gon. Alternatively, if we know the circumradius (radius) of the polygon we can use this below formula to find the apothem. Whole Numbers; . Step 3: Finally, the perimeter of the regular polygon will be displayed in the output field. (Both interior and exterior angles are the same). USE AT YOUR OWN RISK. Hence, the perimeters are different. "A two-dimensional (2D) shape having straight lines connected to each other at particular angles is termed a polygon" Where: R = circumradius r = inradius a = side lengths n = number of sides x = interior angle y = exterior angle A = area P = perimeter Our polygon calculator finds all these values based on only one value provided. Property Description for 86-5311 ADMIRAL WAY. Manage Settings for (var i=0; i