# The outer surfaces of a box are covered with gold foil, except the bottom. The box measure 6 in. long, 4 in. wide, and 3 in. high. How much gold foil was used?

Jan 31, 2016

First calculate the surface area of the entire figure. You can then subtract the bottom.

#### Explanation:

S.A = $\left(6 \times 4 \times 2\right) + \left(4 \times 3 \times 2\right) + \left(6 \times 3 \times 2\right) - \left(6 \times 4\right)$

S.A = $48 + 24 + 36 - 24$

S.A = 84 inche${s}^{2}$

84 square inches of gold foil was used to cover the box.

Practice exercises:

1. The following prism is a package of Toblerone chocolates. Assuming that the logo Toblerone is etched on $\frac{1}{8}$ of the total surface area, find the surface area that the logo covers, rounded to the nearest hundredth

Good luck!