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Topic: What's a 9,11,12,etc-sided figure called?
Replies: 38   Last Post: Dec 16, 2010 10:17 AM

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 Joshua Zucker Posts: 1,450 Registered: 1/30/05
Re: What's a 9,11,12,etc-sided 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

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 n-gon, so you are always safe to use the terminology "12-gon, 15-gon, etc."
>

Right! That's the best approach. People might not know what an
enneagon is, but they'll surely know a 9-gon.

--Joshua Zucker

Date Subject Author
8/24/97 J. Stefanek
8/25/97 Sarah Seastone
10/9/03 geoffy
10/12/03 Ken.Pledger@vuw.ac.nz
10/13/03 John Conway
10/13/03 me@talmanl1.mscd.edu
10/13/03 Ed Wall
10/13/03 Mary Krimmel
10/13/03 Steve Earth
10/14/03 John Conway
5/3/06 brandon park
5/27/06 bgormalley@gmail.com
12/8/03 chris
12/12/03 Eur Ing Panagiotis Stefanides
11/25/03 india
3/8/04 tyesha
1/8/04 Lavonte Smith
1/19/04 Dr. Bluca
1/20/04 John Conway
9/17/04 Laike
5/3/06 brandon park
5/3/06 brandon park
3/22/04 Alex Hebert
3/23/04 Mary Krimmel
8/25/97 J. Stefanek
8/25/97 John Conway
12/3/03 Eur Ing Panagiotis Stefanides
12/2/03 Lauren
4/16/07 Paris
2/6/08 ???
2/25/08 K. E. Pledger
3/6/08 xamcire
12/16/10 chase
3/7/04 Jack
5/30/06 NealAgMan@aol.com
5/30/06 Joshua Zucker
5/30/06 NealAgMan@aol.com
2/26/08 Rich Kleinschmidt
2/27/08 K. E. Pledger