You cannot calculate interior angles in a polygon. You can only calculate their sum. The sum of all the interior angles of an n-sided polygon is (n-2)*180 degrees.
So for example, the interior angles of a triangle (n = 3) sum to 180 degrees. But the individual angles can be (1,1,178), or (30,60,90) or infinitely many other combinations.
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The hexagon is the only one that has exactly 6.All polygons with 6 or more sides have at least 6 interior angles.
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All regular polygons have equal lengths and equal interior angles but irregular polygons have variations in sizes.
Regular polygons are those polygons that are bothequilateral (all sides congruent) and equilateral (all interior angles congruent).