Formulas for finding the area of convex polygons

The area of a convex n-gon with sides a, b, c... in terms of the radius of the inscribed circle r and the semiperimeter p_n

Formulas for finding the area of regular polygons

Area of a regular triangle with side a

Area of a square with side a

Area of a regular hexagon with a side a

Area of a regular n-gon with side a

The area of a regular n-gon with side a given the radius of the inscribed circle r and the semiperimeter p_n = n*a/2