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Re: What's a 9,11,12,etcsided figure called?
Posted:
May 30, 2006 1:22 PM


On 5/30/06, NealAgMan@aol.com <NealAgMan@aol.com> wrote: > the only ones I can remember with any certainty: > > 9 sides: nonagon
Only if you don't mind mixing latin (non) with greek (gon). I prefer enneagon.
> 11 sides: undecagon (although I think there is another name)
Similarly, hendecagon is purely greek, while undecagon mixes the latin again.
> 12 sides: dodecagon > 15 siees: pentadecagon
Should be "pentakaidecagon" to avoid confusion  the "kai" meaning "and".
http://mathforum.org/dr.math/faq/faq.polygon.names.html has the details.
> Remember that the general polygon of n sides is called an ngon, so you are always safe to use the terminology "12gon, 15gon, etc." >
Right! That's the best approach. People might not know what an enneagon is, but they'll surely know a 9gon.
Joshua Zucker



