Triskaidecagon or Tridecagon
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A 13-sided polygon is a tridecagon. (also triskaidecagon)
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Triskaidecagon or Tridecagon
A 13 sided polygon also called a triskaidecagon or tridecaogn has a total 1980 degrees for its interior angles.
A five-sided polygon is called a pentagon.
triskaideka as in triskaidekaphobia - the fear of the number thirteen or a 13-sided polygon can either be called a triskaidecagon or a tridecagon.
A 39 sided polygon is called a 39-gon.