Question

A rectangular gift box is 9inches inches wide, 12 inches long and 5 inches tall. How much wrapping paper is needed to cover the box exactly

Answer 1

You will
`426 \:in^2` wrapping paper to cover the box.

Explanation:

To find how much wrapping paper you will need to cover the box, you will have to find the surface area.

The surface area is the amount of area around the outside of an object.

The outside surface area of a box is given by

`S=2(h \cdot W) + 2(h\cdot L) + 2(W \cdot L)`

where h is the height, W is the width, and L is the length of the box.

From the information given we know that the height is 5 inches, the width is 9 inches, and the length is 12 inches.

Applying the above formula we get that

`S=2(5 \cdot 9) + 2(5 \cdot 12) + 2(9 \cdot 12) \\S=2\cdot \:45+2\cdot \:60+2\cdot \:108\\S=90+120+216\\S=426 \:in^2`

You will
`426 \:in^2` wrapping paper to cover the box.