Exercise 1 Page 591

To calculate the surface area of a rectangular prism, we can use the formula below. The terms inside the parentheses represent the area of the three possible different sized faces. Each term is multiplied by $2,$ because opposite faces on a rectangular prism have equal dimensions. These are the same dimensions as we used above, so we will substitute them into the formula to calculate $S.$ The surface area is $158{\text{ft}}^2.$