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Math Forum » Discussions » Math Topics » geometry.puzzles.independent

Topic: 2 sided polygon on a sphere
Replies: 17   Last Post: Mar 14, 2008 4:54 PM

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David W. Cantrell

Posts: 827
Registered: 7/2/06
Re: What do you call a 2 sided polygon?
Posted: Oct 26, 2007 8:37 AM
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"K. E. Pledger" <Ken.Pledger@MCS.VUW.AC.NZ> wrote:
> > so what would it be?bigon?digon?or what?tell me need an answer!!!!
>
> Since the "-gon" comes from Greek, it's preferable to use the
> Greek prefix "di-" rather than the Latin prefix "bi-". The same applies
> to a 9-gon: "enneagon" rather than "nonagon".

And of course other examples could be given from geometry.

Hemisphere - both parts are Greek

Semicircle - both parts are Latin

We don't say semisphere or hemicircle.

David

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