# Octagon – A polygon with 8 sides

**An oct**opus (octagon) has **8** tentacles (8 sides).

**Example 1**

A regular convex octagon such as this has 8 sides of equal length and an internal angle of 135° between each side.

**Example 2**

This is a concave octagon.

**Example 3**

This shape may look a bit like a boat but is classified as an octagon due to it having 8 sides.

**Example 4**

This may not look like an octagon but it has 8 sides, so it is an octagon.

**Example 5**

This is an irregular octagon as the sides are not of equal length and the internal angles between the sides are not all the same.