Total sum of interior angles of a polygon of n sides is found by the equation:
S = 180(n-2)
For n = 9, S is 1260. Divide 1260 by 9 to get (for regular nonagon):
=140
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Each interior angle measures 140 degrees
Each interior angle measures 140 degrees
140 degrees.
Each interior angle of a regular nonagon measures 140 degrees.
Each interior angle is 140 degrees. Each exterior angle is 220 degrees.