(1)\ area:\hspace{50} S={\large\frac{na^2}{4tan({\large\frac{\pi}{n}})}}\\
(2)\ perimeter:\ L=na\\
(3)\ peak\ angle:\ \theta=180(1-{\large\frac{2}{n}}),\hspace{20} at\ degree\\
(4)\ number\ of\ diagonals:\ m={\large\frac{n(n-3)}{2}}\\">
[1-7] /7 | Disp-Num |