A cake is a rectangular prism with height 4 inces and base 12 inces by 15 inches. Wallace wants to apply frosting to the sides and the top of the cake. What is the surface area of the part of the cake that will have frosting?
the top is 12x15 =180 sq in
two sides are 4x12=48 sq in so 96 sq in total
two sides are 4x15=60 sq in so 120 sq in total
180 + 96 + 120 = 396 sq in of frosting area
