Question

the ratio of length and breadth of a rectangle is 4:5.if the perimeter of rectangle is 144cm.find its area​

Answer 1

Answer:

let length be 4x and breadth be 5x

perimeter = 2(4x+5x)

144/2 = 9x

72/9 = x

8 = x

length = 32cm

breadth = 40cm

Area= l×b

= 32×40

=1280cm²

Answer 2

let the length and breadth be 4x and 5x

perimeter = 2(l+b)

144 = 2(4x+5x)

144=2(9x)

144=18x

x=144/18

x=8

length= 4×8=32

breadth= 5×8=40

area= length×breadth

= 32×40

=1280 cm^2