Nonagon -- from Wolfram MathWorld
- ️Weisstein, Eric W.
- ️Wed Apr 19 2006
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The nonagon, also known as an enneagon, is a 9-sided polygon. Although the term "enneagon" is perhaps preferable (since it uses the Greek prefix and suffix instead of the mixed Roman/Greek nonagon), the term "nonagon," which is simpler to spell and pronounce, is used in this work.
Several special types of nonagons are illustrated above. In particular, a nonagon with vertices equally spaced around a circle and with all sides the same length is a regular polygon known as a regular nonagon.
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Weisstein, Eric W. "Nonagon." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Nonagon.html