The proposed name for a nine sided polygon is Nonagon or Enneagon. If you were going to talk about a 99 sided polygon then you would call it an Enneacontakaienneagon. Polygons are a plane figure where each line segment touch each other but do not cross each other.
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Ah, a 99-sided polygon is called a "enneacontakaienneagon." Just imagine all those beautiful angles and sides coming together like a happy little family, creating a unique shape that is truly special. Remember, there are no mistakes in geometry, just happy little accidents waiting to be discovered.
A 99-sided polygon is called a "enneacontakaienneagon." The name is derived from the Greek words "ennea" for nine and "kontakai" for ten. The suffix "-gon" is added to denote a polygon with a specific number of sides.
There is no assigned name, but names for polygons use Greek prefixes, so using the prefix for 90 (enneaconta) and for 9 (ennea), it would be an enneacontakaienneagon or enneacontaenneagon.
(An alternate name could be nonacontanonagon, using the alkene protocol of units followed by tens, and the Latin prefix nona-.)
The name of a 99 sided polygon is enneacontaenneagon.
A five sided polygon is called a pentagon because pentagon means five sided polygon I think.
A 12-sided polygon is called a dodecagon.
A million-sided polygon is called a megagon.
A 20-sided polygon is called an icosagon.