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If you mean a regular 9 sided nonagon Total interior angles are (9-2)*180 = 1260 degrees Each interior angle is 1260/9 = 140 degrees
Area of plane figure
To find the interior angle of a polygon, you can use the formula: interior angle = (n-2) * 180 / n, where n is the number of sides of the polygon. In this case, for a 27-sided shape, the interior angle would be (27-2) * 180 / 27 = 150 degrees.
A 14 sided polygon has 14 angles. If this polygon is a regular polygon, then in order to find the sum of the angles we can use the formula, (n - 2)180°, where n is the number of the sides. (n - 2)180° = (14 - 2)180° = 2,160° Thus each angle will be approximately 154.29° (2,160°/14).