it has 13 sides
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In geometry, a triskaidecagon has 13 sides and 13 angles. A triskaidecagon is also called a tridecagon. A tridecagram is a 13-sided star polygon.
A dodecagon has 12 sides. A polygon with 13 sides is a triskaidecagon.
triskaidecagon
a tidecagon or triskaidecagon
It cab be called a triskaidecagon or a tridecagon