Question

The surface area of a rectangular prism is 2LW + 2LH + 2WH, where L is the length, w is the width, and h is the height. Find the surface area of a prism whose length is 5 feet, width is 8 feet and height is 9 feet.

Answer 1

we can simplify to get
SA=2(LW+LH+WH)

substitute 5 for L, 8 for W and 9 for H


SA=2(5*8+5*9+8*9)
SA=2(40+45+72)
SA=2(157)
SA=314

the surface area is 314 square feet