The sum of the interior angles of a nonagon is (9 - 2) x 180o = 7 x 180o = 1260o
In a regular nonagon, each interior angle is 1260o ÷ 9 = 140o
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A 'nonagon' is any closed figure with nine sides. Its interior angles always add up to 1,260°, so it could have several right angles in it. But if it's a 'regular' nonagon, then every interior angle is 140°.
A nonagon has 9 sides. It can have one or more 90 degree angles. If it is a regular nonagon then it has 180*7/9 for the interior angle measures which is 140 degrees.
The sum of the interior angles of a nonagon is calculated using the formula (n - 2) × 180°, where n = 9. Substituting the values, we get (9 - 2) × 180° = 1260°. This means the total sum of all interior angles in a nonagon is 1260 degrees. Each interior angle in a regular nonagon is 140 degrees.
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.