It depends on what you are summing together: the lengths of the sides - to find the perimeter - or the exterior or interior angles - to satisfy a maths question.
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The sum of the interior angles of any polygon is equal to (n - 2) x 180 degrees. in this case, (15 - 2) = 13 x 180 = 2340 degrees.Therefore, the sum of the interior angles of a 15-sided figure (a pentadecagon) is 2340 degrees.
The sum of the angles of an 8 sided octagon add up to 360 degrees
The sum of a 10 sided figure is 1440 To solve it or the sum of any other figure you do this... 180(n-2) n equals the number of sides the figure has 180(10-2) 180(8) 1440
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