1260
To find the number of degrees its 180(n - 2) where n is the number of sides. So...
180(9-2)
=180(7)
=1260
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The sum of the interior angles of a nonagon is 1260 degrees.
A nonagon has 9 rotation symmetry
There are 1260 degrees, with each angle measuring 140 degrees.
A regular nonagon has 9 obtuse angles of 140 degrees
The exterior angles of a nonagon add up to 360 degrees.