Only if the polygon is "regular".
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Only when it is a regular polygon that all interior angles are of equal measure
If all of its interior angles are equal then it is a regular polygon
Only when the polygon is a regular convex polygon. Such as an equilateral triangle, or a square, or a regular pentagon.
The sum of the interior angles of any regular polygon of n sides is equal to 180(n - 2) degrees. 1980 degrees.
The polygon will have 12 equal sides and each interior angle measures 150 degrees.