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If its a regular 9 sided polygon then the exterior angles are 40 degrees.
Each exterior angle = 360/number of vertices = 360/9 = 40 degrees.Each interior angle = 180 - exterior angle = 180 - 40 = 140 degrees.
Each exterior angle: 40 degrees Each interior angle: 140 degrees
Any polygon can have a 40-degree angle. It doesn't have to, but it can.
Since the interior angle measure of the regular polygon is 140⁰, its exterior angle measure is 180⁰ - 140⁰ = 40⁰. Since the sum of the exterior angle measures is 360⁰, the polygon has 360⁰/40⁰ = 9 sides.