If the floor is a square, then each side of the floor has length square root of 784 which is 28 feet,
That is because: The area of a square is its length times its width. A square has all 4 sides the same so its length is the same as its width. A = l*w A = l*l because w = l A = l^2 784 = l^2 sqrt(784) = l 28 = l
