Question

In a rectangle the length is six times of its breadth,if the perimeter is 420centimeter then find the Area of rectangle?

Answer 1

let breadth =x
length=6x
perimerer=2(l+b)
=2(x+6x)
=2(7x)
=14x
perimeter =420 cm
14x=420cm
$x = \frac{420}{14}$
x=30
breadth=30cm
length=180cm
area=l×b
=5400 sq.cm