\\(Area=\\frac{s^2n}{4tan{180\\over{n}}}\\) where s is the length of any side and n is the number of sides. \\(Area=\\frac{r^2nsin{360\\over{n}}}{2}\\)where r is the circumradius and n is the number of sides. Area=a^2ntan{180\\over{n}} where a is the length of the apothem and n is the number of sides.