Question

find the perimeter of a rectangular field whose length is 4 times its breadth and which area equal to 20736 square metre

Answer 1

let b = x
so l = 4x

area of recTriangle = 20736
l×b = 20736
4x2 = 20736
x2 = 5184
x = √5184
x = 72
so,
4x = 4×72
=288