The perimeter is the sum of all sides 455 = 3x + 1.5x + 180 + x which is the same as 455 = 5.5x + 180, 455 - 180 = 5.5x 275 = 5.5x x = 275/5.5 x = 50 ft. Therefore, one side is 3*50 = 150 ft; other side is 1.5*50 = 75 ft; the last side is 50 ft. ANSWER