In Geometry, an octagon is referred to as a polygon. It has eight sides and two angles. These two angles are known as Interior angle and Exterior angle. An interior angle is approximately 135°. In order to find an interior angle the formula applied is 180n–360)/n. An exterior angle is approximately 45°. To get the exterior angle of a regular octagon, calculate the linear pair with the interior angle, so in broad it is set by the formula 180-interior angle.

A regular octagon is an octagon whose sides are all the equal length and whose internal angles are all the similar size. The internal angle at each apex of a regular octagon is 135°.

A regular octagon is an octagon whose sides are all the equal length and whose internal angles are all the similar size. The internal angle at each apex of a regular octagon is 135°.