Question

find the perimeter of a rectangular field whose length is 4 times that and which has area equal to 20736 sq.m.

Answer 1

Let the breadth = x
and the length =4x

area of rect.=length*breadth
20736=4x*x
20736=4x²
20736/4=x²
5184=x²
√5184=x
72=x
breadth=72
length  =4*72=288
perimeter=2(length+breadth)
perimeter=2(288+72)
perimeter=2*360
perimeter=720