# Regular Octagon Area (related to the span)

## 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 side and the length of the span of the octagon, or the second shortest diagonal.

## Variables

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

S | Length of the span( the second shortest diagonal) (m) |

a | Length of the side (m) |