tridecagon
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A 13 sided polygon is called a Tridecagon also a Triskaidecagon.
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dodadecoganogon
A 13-sided polygon can either be called a triskaidecagon or a tridecagon.
the Greeks used prefexes up to ten, modernly we have sdded dodecagon for a twelvesided object and undecagon for an eleven sided object so the propor name would be a 27 sided object.