Its 180(13-2)=
180(11)=
1980
I used the formula for determining angle degrees which is
180(n-2) when
n=the number of sides
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A 13 sided polygon also called a triskaidecagon or tridecaogn has a total 1980 degrees for its interior angles.
Triskaidecagon or Tridecagon
triskaidecagon
Triskaidecagon
Tridecagon (or triskaidecagon).Check out a list that includes the first 20 at the University of Regina Related Link, below.