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`)

Options

A. `550` rs
B. `500` rs
C. `528` rs
D. `510` rs

Answer

C

Explanation

`c = 2 pi r`

`= 21 xx pi `

`= 21 xx 22/7`

`= 66m`

length of the rope =`2xx66 = 132 m`

total cost of rope = length `x` cost of `1 m` rope

`= 132 xx 4 = 528 rs`

answer