If each exterior angle is 9 degrees then it is a regular 40 sided polygon.
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360 / 9 = 40
Each exterior angles measures 40 degrees Each interior angle measures 140 degrees
40
The sum of the exterior angles of a regular polygon equal 360° .If one such angle measures 40° then the polygon has 360/40 = 9 sides.
The sum of the exterior angles in any polygon is 360 degrees. A nonagon has 9 sides, so to work out a single exterior angle, we divide 360 by 9, which is 40.