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A nonagon is a 9 sided polygon having 9 interior angles
if the exterior angle is 40 degrees the interior angle of the polygon is 180- 40 = 140 degrees. The equation for sides N is interior angle = 180 x (N-2)/N; solving you find N = 9 sides
A nonagon is a polygon that has 9 sides and 9 angles
The sum of the interior angles of a polygon with N sides is: N*180° - 360°A nonagon has 9 sides, so N=9: Sum of interior angles = 9*180° - 360° = 1260°If it is regular (all nine sides equal, and all angles equal) then each angle is (1260° / 9) = 140°
It is a nonagon