A 12-sided polygon is called a dodecagon.
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The name of a 12 sided polygon is Dodecagon.
An 11 sided polygon is a hendecagon and a 12 sided polygon is a dodecagon
A five sided polygon is called a pentagon because pentagon means five sided polygon I think.
any polygon with more than 12 sides is called an n-gon
Duodecagon <--wrong... a duodecagon is a 12-sided polygon. icosagon is a 20 sided polygon.