Question

The length of a rectangle is four times its width.
If the perimeter of the rectangle is 80cm , find its area.

Answer 1

do you know what the Area and Perimeter formulas for a rectangle are?

Answer 2

yes

Answer 3

well, then all you need to know is that the Length is 4 times the Width, that is, if Width is "W", Length is "4W", thus the perimeter will be 2(4W+W) = 80

from there you can solve for W to see what "W" is, once you have W, 4W gives you L

when you have W and L, well, just use the Area formula :)

Answer 4

let width=x
length=4x
perimeter=2(l+w)=2(4x+x)=10x
10x=80
x=8
width=8cm
length=4*8=32cm
area=32*8=256cm^2