(number of sides - 2)*180 = total sum of interior angles
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find the sum of the measures of the interior angles of 13-gon.
The interior angles add up to 4680 degrees
The sum of the interior angles add up to 3240 degrees.
The interior angles of a dodecagon sum to 1800 degrees.
No, the interior angles of a triangle sum to 180o The interior angles of a quadrilateral sum to 360o.