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360 degrees. The sum of the measures of the exterior angles of any polygon is 360°.
Sum of exterior angles = 360 degrees Sum of interior angles = 1440 degrees
The sum of the exterior angles of all polygons equals to 360⁰.Since only the sum of the interior angles of all quadrilaterals equals to 360⁰, the polygon must have 4 sides.
The sum of the exterior angles is always 360 degrees.
Sum of interior angles of n-sided polygon = 180n - 360 degrees. When n = 20 this gives 3240o