48 inches.
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It is: 4*12 = 48 inches
Area = 144 sq inches => Length of side, L = 12 inches => Perimeter = 4*L = 48 inches.
144 in2
area = 144 square units perimeter = 48 units
The formula for the area (A) of a square is A = L2 where L is the side length of the square. Therefore L = √A. The formula for the perimeter (P) of a square is P = 4L : as L = √A, then P = 4√A When A = 144, then P = 4 √144 = 4 x 12 = 48.