You don't, because there is no such thing as a nonogon. It is a nonagon. And you could try alternating ns in the two words: nine and nona...
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A nonogon has 9 sides
The sum of the interior angles of a polygon of n sides is 180o * (n-2). For a regular nonagon (9 sides), the sum is (9 - 2) * 180o = 1260o, so each interior angle is 1260o / 9 = 140o. The exterior angle is the supplement of the interior angle: 180o - 140o = 40o.
There are 27 diagonals in a nonagon.
140 degrees
on the bottoms of glasses