After nonagon (or alternatively ennagon-also 9 sides) comes decagon (deca=10), then hendecagon (or undecagon)(hen or un=1+deca(10)=11 sides), followed by dodecagon (do=2+deca=12)... you can see a great list of polygon names here:
http://www.pubquizhelp.com/sci/polygon.html
Hope that helps, and you have a great day!
Asuka Jr.
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