A "polygon angles sides" makes no sense. So it is not clear what is 3240. Second, the question does not say the what is to be summed. Please resubmit after thinking a bit more about the question.
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15 sides
n is number of sides. Sum of interior angles is 180n - 360, so 180n = 2880 + 360, ie 3240 and n = 3240/180 ie 18.
The sum of the exterior angles of all polygons equals to 360⁰.Since only the sum of the interior angles of all quadrilaterals equals to 360⁰, the polygon must have 4 sides.
The sum of the interior angles of any regular polygon of n sides is equal to 180(n - 2) degrees. 6660 degrees.
The sum of the exterior angles of a polygon, with any number of sides, is 360 degrees.