The area of the face of the square is the side length x the side length. So 0.3333 x 0.3333 = 0.11108889. Since a square has 6 sides, multiply 0.11108889 with 6. So it equals 0.66653334.
Finding are of a square is the same as any other shape, even if the sides are all the same length. You multiple length by width (1/3x1/3) which gives you about 0.1111
