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A gardener wants to fence a circular garden of diameter $21\ m$. 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 $₹\ 4$ per meter. $(Take\ \pi=\frac{22}{7})$
Diameter of the circular garden$=21\ m$
Radius$=\frac{21}{2}\ m$
Circumference$=2\pi r$
$=2\times\frac{22}{7}\times\frac{21}{2}$
​
$=66\ m$
Length of rope needed for 2 rounds
$=2\times66\ m=132\ m$
Cost of the rope$=Rs\ 4\times132=Rs\ 528$
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