A decagon is a ten-sided polygon. Several special types of decagons are illustrated above. In particular, a decagon with vertices equally spaced around a circle and with all sides the same length is a regular polygon known as a regular decagon.

# Decagon

## See also

Hexagon, Octagon, Pentagon, Polygon, Regular Decagon Explore this topic in the MathWorld classroom## Explore with Wolfram|Alpha

## Cite this as:

Weisstein, Eric W. "Decagon." From *MathWorld*--A Wolfram Web Resource. https://mathworld.wolfram.com/Decagon.html