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 $â‚¹\ 4$ per meter. $(Take\ \pi=\frac{22}{7})$

Academic Mathematics NCERT Class 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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Updated on: 10-Oct-2022

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