Hexagon:
ABCDEF is a regular hexagon with each side equal to ‘a’ then
▪ Each interior angle = 120 degrees
▪ Each exterior angle = 60 degrees
▪ Sum of all the exterior angles = 360 degrees
▪ Sum of all the interior angles = 720 degrees
▪ Area = $$\frac{3\sqrt{\ 3}}{2}a^2$$.
Octagon:
ABCDEFGH is a regular octagon with each side equal to ‘x’ then
▪ Each interior angle = 135 degrees
▪ Each exterior angle = 45 degrees
▪ Sum of all the exterior angles = 360 degrees
▪ Sum of all the interior angles = 1080 degrees
▪ Area = $$2\left(1+\sqrt{2}\right)x^2$$
