# Regular Octagon Area (related to the inradius)

## Description

Octagon is a polygon that has eight sides.

A regular octagon is a closed figure with sides of the same length and internal angles of the same size. The internal angle at each vertex of a regular octagon is 135°. The area of a regular octagon is related by the length of the radius of the inscribed circle of the octagon.

## Variables

A_{o} | Area of the octagon (m^{2}) |

π | pi |

r | Inradius (m) |