Question

If the diameter of a circular pond is 70m ,find the cost of fencing around it
with for rounds cost Rs 12 per metre.
pi=22/7​

Answer 1

$\sf{Diameter\:of\:circular\:pond = 70m}$

$\sf{Radius\:of\:circular\:pond\: \frac{70}{2}m }$

$\sf{Now,\: circumference\: of \:circular \:pond\:2\pi \: r = 2 \times \frac{22}{7} \times \frac{70}{2} }$

$= >2 \times 11 \times 10 m = 220m$

$\sf{The \: fencing \: makes \: 4 \: rounds \: of \: fence \: so \: the \: total \: length \: of \: the \: rope \: of \: fencing =2×2πr=2×220=440m}$

$\sf{Since \: the \: cost \: of \: 1 \: meter \: rope=Rs. 12}$

$\sf{Therefore, \: cost \: of \: 440 \: meter \: rope=12× 440=Rs. 5280.}$

$\mathcal{\blue{Hence \: the \: answer\:is\:Rs.5240}}$