In every convex polygon, the sum of the measure of the interior angles is given by the expression SUM = 180 ° (n - 2) where n is the number of sides. In our case n = 48 so, the correct answer is
SUM = 180 ° (n - 2) = 180 ° (48 - 2) = 180 ° x 46 = 8280
so the correct answer is 8280