Volume = Length x Base x Height Volume = 3.5 x 6 x 3 = 63 ft^3
Surface Area (if we're talking about a closed box and only talking about the outside area) = ∑Areas of the sides Surface Area = 3.5 x 6 + 3.5 x 6 + 6 x 3 + 6 x 3 + 3.5 x 3 + 3.5 x 3 = 99 ft^2
