Question

The length of a rectangle is three times its width.
If the perimeter of the rectangle is 56in , find its area.

Answer 1

if width is x,what's its length?

Answer 2

Hint: Formula for perimeter is 2(w)+2(l).

Answer 3

where w is width and l is length.

Answer 4

Length= 3 x width
Let width= w

Perimeter = 2(width)+2(length)
56=2(w)+2(3w)
56=2w+6w

Solve for w.
After finding w, you can find the length by substitution w=? into the length equation.

After finding the length, you can now find the area which formula is...

Length x Width