To determine how long each side of a square playing field is, you need to divide the total area by 4. Because the shape of the playing field is a square, it is safe to assume that each of the four sides is the same length. Therefore, the total area of the playing field is 1,255; there are 4 sides as the shape of the playing field is a square; the length of each side is the same, as the playing field's shape is a square; the length of each side is 1225 divided by 4 which equals 306.25 yards.