Question

the side of a rectrangle are in the ratio 4:5,find its side if its perimeter is 90 cm​

Answer 1

Answer:

Let the constant be n.

Perimeter=2(l+b)

90=2(4n+5n)

45=9n

n=45/9

n=5

Sides are 4n=4(5)=20 cm

and 5n=5(5)=25 cm

Answer 2

Answer:

let length be 4x and breadth be 5x

perimeter of rectangle =90

2×(4x+5x)=90

2×(9x)=90

9x=90/2

9x=45

x=5

length =4×5=20

breadth =5×5=25