There is not a general formula for the sum of the sides of an arbitrary polygon.
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The sum of the lengths of the sides of a polygon is called the perimeter.
The formula for the sum of the interior angles of a polygon is: 180 * (n - 2) where n is the number of sides of the polygon. So the sum of the angles of a polygon with 25 sides is 180 * 23 = 4,140.
Assuming the sum refers to that of the interior angles, the polygon has 27 sides.
The polygon would have 10 sides.
It is the perimeter of the polygon