A 10footwide by 12footlong by 7foothigh box is to be made ou

A 10-foot-wide by 12-foot-long by 7-foot-high box is to be made out of plastic. What is the surface area of the box?

Solution

Length of the box, l = 12 ft,

width, w = 10 ft and

height, h = 7 ft

Surface area of the box, A

= 2 (l*w + w*h + h*l)

= 2 (12 *10 + 10 * 7 + 7 *12)

= 2 (120 + 70 + 84)

= 2 (274)

= 548 square ft.