The four corners are just 40 cm down, which means that the diagonal length of the square is 0.4 m (40 cm) X2+ the diameter of the circular desktop is1.4m = 2.2m. Then, according to the Pythagorean theorem, if the side length of the square is x, 2x 2 = 2.2, and the solution is x 2 = x 2 =1.