An octagon is an eight-sided polygon. Several special types of octagons are illustrated above. In particular, an octagon with vertices equally spaced around a circle and with all sides the same length is a regular polygon known as a regular octagon.
Octagon
See also
Hexagon, Pentagon, Polygon, Regular Octagon Explore this topic in the MathWorld classroomExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Octagon." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Octagon.html