7. A gardener wants to fence a circular garden of diameter 2 im with 3 round Find the length of the wire he needs to purchase and cost of it at the rate of Rs.4 per metre.
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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 costs of the rope, if it cost Rs. 4 per meter.(Take π=722)
Answer:
Diameter of the circular garden=21m
∴ Radius of the circular garden=221m
Now, circumference of circular garden=2πr=2×722×221
=22×3=66m
The gardener makes 2 rounds of fence so the total length of the rope of fencing =2×2πr=2×66=132m
Since the cost of 1 meter rope=Rs. 4
Therefore, cost of 132 meter rope=4× 132=Rs. 528.
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