A hendecagon is an 11-sided polygon, also variously known as an undecagon or unidecagon. The term "hendecagon" is preferable to the other two since it uses the Greek prefix and suffix instead of mixing a Roman prefix and Greek suffix.

A hendecagon with vertices equally spaced around a circle and with all sides the same length is a regular polygon known as a regular hendecagon.

See also

Polygon, Regular Hendecagon Explore this topic in the MathWorld classroom

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Cite this as:

Weisstein, Eric W. "Hendecagon." From MathWorld--A Wolfram Web Resource.

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