A nonagon is a polygon with 9 sides. The formula to calculate the measure of each interior angle in a regular polygon (a polygon with all sides and angles equal) is 180(n-2)/n, where n is the number of sides.
So, the measure of each angle in a nonagon is 180(9-2)/9 = 180(7)/9 = 1260/9 = 140 degrees.
Calculate the size of each angle in a regular nonagon
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