The perimeter is solved by using the formula:
P = 2 l + 2 w
where l is the length of one side = 15 inches, and w is width of one side = 1 ¾ ft = 21 inches
P = 2 (15 inches) + 2 (21 inches)
P = 72 inches
We know that there are 36 inches in 1 yard therefore:
P = 72 inches * (1 yard / 36 inches)
P = 2 yards