A gardener wants to fence a circular garden of diameter 21m .find the length of the rope he needs to purschase ,if he makes 2 rounds of the fence also find the cost of a rope if it costs Rs 4 per metre (take x =22/7)
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Diameter of the circular garden=21m
∴ Radius of the circular garden=21/2m
Now, circumference of circular garden=2πr=2*22/7*21/2
=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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