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A 13 sided polygon also called a triskaidecagon or tridecaogn has a total 1980 degrees for its interior angles.
An interior angle is an angle defined by two sides of a polygon and that is inside the polygon. Opposite interior angles are specific pairs of interior angles, those that are opposite each other in the polygon. Alternate or opposite interior angles are also angles that lie on opposte sides of the tranversal line that cuts through parallel lines.
It's a square which also has 4 interior right angles
They all add up to 360 degrees. Also, opposite angles are congruent (equal) and any two adjacent/consecutive angles add up to 180 degrees. This term is also called supplementary.
-- The sum of the four exterior angles is 360 degrees. -- The sum of the four interior angles is also 360 degrees. -- So the sum of all the interior and exterior angles is 720 degrees.