Polygon calculator is very useful for solving the regular polygon , Just give the number of sides and one of the following:- 1-The side length or 2-Incircle diameter or 3-Circumcircle diameter Then , the app calculates the following:- 1- Side angle 2- Summation of internal angles 3- Polygon area 4- Polygon perimeter 5- Draw circumcircle and incircle circles