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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 `pi=22/7`)

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`c = 2 pi r`
`= 21 * pi `
`= 21 * 22/7`
`= 66m`
length of the rope =`2*66 = 132 m`
total cost of rope = length x cost of 1 m rope
`= 132 xx 4 = 528 rs`
answer

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