The fencing is the perimeter of the rectangular field. Perimeter is the summation (addition) of the length of the sides of a shape Rectangle has 4 sides. The perimeter of the rectangular field =2×50+2×y But the perimeter is given as 260 m 260=2×50+2×y Solve for the value of y 260=100+2xy 260−100=2xy 160=2xy Divide both sides by 2 y=