Perimeter of the parallelogram = 54 inches Length of one side of the parallelogram (a) = 18 inches Let us assume the length of the adjacent side (b) = x inches Now we already know Perimeter of a parallelogram = 2 (a + b) 54 = 2(18 + x) 54/2 = 18 + x 27 = 18 + x x = 27 - 18 = 9 So the length of a side adjacent to 18 inches side is 9 inches.
