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The sum of the exterior angles of any polygon is 360 degrees.
Sum of interior angles of n-sided polygon is (2n - 4) right angles or 180n - 360 degrees and you may commonly see this written in an equivalent form 180(n-2) degrees. Sum of exterior angles is always 360 degrees.
Exterior angles of ANY polygon add to 360 degrees. Individual angles are therefore 360/n where n is the number if sides. 72
The sum of the interior angles of a polygon can be calculated using the formula (n-2) * 180 degrees, where n is the number of sides. For a 19-sided polygon, the sum of the interior angles would be (19-2) * 180 = 17 * 180 = 3060 degrees.
(n-2)(180) use that formula to find the sum of the interior angles of a polygon in degree