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