360 degrees as is with all other polygons!
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all regular polygons (such as a pentagon) have the sum of their exterior angles = 360 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.
As for all polygons the exterior angles add up to 360 degrees
All exterior angles of any polygon sum to 360 deg. If there are 9 angles then each angle is 40 degrees.
You are supposed to use the fact that the sum of all three angles is 180°.