Let W be the width (in meters). Then the length is 4W. The Pythagorean equation for the diagonal is W^2 + (4W)^2 = 150^2, or W^2 + 16W^2 = 22500, 17W^2 = 22500 W^2 = 22500/17 = 1323.529 W == 36.38 meters. So, the width is 36.38 meters; Hence, the length is 4*36.38 = 145.52 meters. By knowing dimensions, you can easily find the perimeter.