Question

A rectangle has a perimeter of 84 meters. One dimension is 7 meters. How long is

the unknown dimension?

Answer 1

The unknown dimension is 35

Explanation:

The perimeter of a rectangle is l+l+w+w or 2l+2w (l=length, w=width)

`l+l+w+w=84`

`7+7+w+w=84`

`14+w+w=84`

then we subtract 14 from 84

`w+w=70`

`2w=70`

`(70)/(2)=35`

`w=35`

Let's check our answer

`35+35+7+7=84`

Hope this helps :-)