If it is a regular nonagon, then you use the following formula:
[(s-2) x 180]/s = angle of one interior angle. (s means the number of sides)
Then solve: [(s-2) x 180]/s = [(9-2) x 180]/9 = [7 x 180]/9 = 1260/9 = 140.
Then, for the exterior angle, subtract 140 from 360. The measure of the exterior angle of a regular nonagon is 220.
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Each exterior angle will measure 9 degrees
Providing that it is a regular hexagon then each exterior angle will measure 60 degrees
360/9 = 40 degrees
It will have 10 sides and each interior angle measures 144 degrees while each exterior angle measures 36 degrees
It is: 360/5 = 72 degrees for each exterior angle and each interior angle will be 108 degrees