A cube has faces. It has 1. a front face 2. a back face 3. a left face 4. a right face 5. a top face 6. a bottom face Sometimes faces of cubes are called "sides", but the proper name for a "side" is a "face". Each of those faces is a square and all 6 of them are exactly alike. So to find the area of just 1 face, divide 108 square feet by 6 and get 18 square feet. Edwin