Question

The length of a rectangle is 3 times its width. The rectangle’s width is 4 m. What is the area of the rectangle? Enter your answer in the box. m²

Answer 1

48m²

Explanation:

L= 3*4

W= 4

Area= L*W

A=(3*4)*4

A=12*4

A=48

Answer 2

Call the length
`l` and the width
`w`

We are told:
1. "The length of a rectangle is 3 times its width." i.e.:
`l=3w`
2. "The rectangle’s width is 4 m." i.e.:
`w=4`

So, by substitution we have:

`l=3w`

`l=3(4)`

`l=12m`

Then we can use our area formula:

`A=lw`

`A=(12m)(4m)`

`Area=48m^(2)`