18-2 * 180 = 2880degrees
(number of sides - 2) * 180 will work for any "gon
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It has 18 interior angles.
The sum of the interior angles of an n-gon is given by the formula (n-2)(180) where n is the number of sides of the polygon. Thus, the sum of the interior angles of an 18-gon is (18-2)(180) = 2880.
The question makes no sense since a 18-gon cannot be added. You can add the measures of its interior or exterior angles, or the lengths of its sides, its diagonals and so on. But there is no such thing as a "sum of 18-gon".
its 2880 degrees total
180x28 is the sum of the interior angles in a 30- gon