Find the area of a square with sides of length 1/3 yard. Remember that all sides of a square are the same length.

To find the area of a square, we must multiply the length of one side by itself. In this case, the length of one side is 1/3 yard. So, the area of the square is:

(1/3 yard) x (1/3 yard) = 1/9 square yard

Therefore, the area of the square with sides of length 1/3 yard is 1/9 square yard.