Question

The cost if fencing a circular field at the rate of rs.24per meter is rs5280.The field is to be ploughed at the rate of rs.0.50per m2find the cost of ploughing the field

Answer 1

perimeter of circular field = total cost of fencing / rate of fencing
=5280/24 =220 m
now 2pi r = 220 m
r = 220×7/44
therefore r = 35 m
area of the field =
$\pi \: r {}^{2}$
=
22/7 × 35 ×35 =3850 m2