Question

The length of a rectangle is three times it’s width if the perimeter of the rectangle is 80m find it’s area

Answer 1

=3y^2

Explanation:

let,

length: x

width: y

According to condition,

x = 3y -----------(1)

Second condition

Perimeter = 2 (l + b)

80 = 2 (x + y)

x + y = 40 -------------(2)

To find area,

Area = L x B

=3y x y

= 3y^2