Okay, so we basically need to find the surface area in feet. 1) 10 inches = 10/12 feet = 5/6 of a foot 2) To find the area of a side surface, we have to square the side: (5/6)^2 = 25/36 3) All right! We have six of those squares, so 6(25/36) = 150/36 = 4.166... The closest to this is 4.17 square feet, so C is the answer. Hope this helps!