Sum of interior angles of a nonagon = (n-2)*180 = 7*180 = 1260 degrees.
That is as far as you can go with the information given.
If, and there is no reason to assume so, the nonagon is regular then the internal angles are the same and each is 1260*9 = 140 degrees.
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Each interior angle measures 140 degrees
Each interior angle measures 140 degrees
Each interior angle is 140 degrees. Each exterior angle is 220 degrees.
Each interior angle measures 140 degrees
140 degrees.