The interior angles sum to 1980 degrees.
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A link to a picture of a regular tridecagon (also known as a triskaidecagon), a thirteen-sided polygon, can be found below this answer.
Triskaidecagon or Tridecagon
Triskaidecagon or Tridecagon
In geometry, a tridecagon (or triskaidecagon) is a 13-sided (and angled) polygon.
180 degrees