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Question -

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 offence. Also find the cost of the rope, if it costs ₹ 4 per metre. (Take π =22/7)



Answer -

Diameter of the circular garden = 21 m
∴ Radius = 21/2 m
∴ Circumference = 2πr = 2×(22/7)×(21/2)
= 66 m
Length of rope needed for 2 rounds
= 2 × 66 m = 132 m
Cost of the rope = ₹4 × 132 = ₹ 528

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