The sum of the interior angles of a polygon with N sides is: N*180° - 360°
A nonagon has 9 sides, so N=9: Sum of interior angles = 9*180° - 360° = 1260°
If it is regular (all nine sides equal, and all angles equal) then each angle is (1260° / 9) = 140°
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The nine interior angles of a nonagon add up to 1260 degrees
A nonagon has 9 interior angles that add up to 1260 degrees
No.
No because a nonagon which is a 9 sided shape has 27 diagonals
A nonagon is a 9 sided polygon and its 9 interior angles add up to 1260 degrees