The 9 interior angles add up to 1260 degrees
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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.
The sum of the exterior angles in any polygon is 360 degrees. A nonagon has 9 sides, so to work out a single exterior angle, we divide 360 by 9, which is 40.
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
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.
The answer depends on what elements of a nonagon you measure.