Question

Which of the following correctly calculates the surface area of a rectangular prism with a length of 6 ft., a width of 14 ft., and a height of 12 ft.?(1 point)
Responses

648 ft.2

648 ft. squared

356 ft.2

356 ft. squared

480 ft.2

480 ft. squared

324 ft.2

Answer 1

Surface area = 2(lw + lh + wh) = 2(6·14 + 6·12 + 14·12) = 2(84 + 72 + 168) = 2(324) = 648 ft².

So the correct choice is 648 ft².