Question

A gardener wants to fence a circular garden of diameter $21m$. Find the length of the rope he needs to purchase, if he makes $2$ rounds of fence. Also find the cost of the rope, if it costs $Rs.4$ per meter. $(Take\pi =\frac{22}{7})$

Answer 1

$2$ rounds of fencing $=2$ (circumference)

$=2\left(\pi d\right)$

$=2\pi \left(21\right)$

$=42\pi$

Total cost $=42\pi \left(4\right)$

$=Rs.168\times \frac{22}{7}$

$=Rs.528$