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 costs of the rope, if it cost Rs 4 per meter (Take `pi = 22/7`)
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Solution
d = 21 m
r = 21/2 m
Circumference = `2πr = 2 xx 22/7 xx 21/2` = 66 m
Length of rope required for fencing = 2 × 66 m = 132 m
Cost of 1 m rope = Rs 4
Cost of 132 m rope = 4 × 132 = Rs 528
Concept: Circumference of a Circle
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