Question

The sides of a rectangle are in the ratio of $4:5$. If the perimeter of the rectangle is $90$ cm. find its sides.

Answer 1

Sides of the rectangle are in the ratio of $4:5$

Let the length $l=5x$

and the breadth $b=4x$

Now, perimeter $=2(l+b)=90$cm

$2(5x+4x)=90$

$2\left(9x\right)=90$

$18x=90$

$x=5$

Therefore, Length $l=5x=25$cm

and the breadth $b=4x=20$cm