Any quadrilateral
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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.
Sum of exterior angles = 360 degrees Sum of interior angles = 1440 degrees
Sum of interior angles of n-sided polygon = 180n - 360 degrees. When n = 20 this gives 3240o
4,140 degrees, or 23 'straight' angles.
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.