Any value between 0 and 360 degrees (excluding 180 degrees).
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Each exterior angle: 40 degrees Each interior angle: 140 degrees
Each exterior angle = 360/number of vertices = 360/9 = 40 degrees.Each interior angle = 180 - exterior angle = 180 - 40 = 140 degrees.
Each angle for a regular nonagon is 140 degrees each.
It is: 180-interior angle = exterior angle
the hypotenuse is the exterior angle