Question

the inner circumference of a circular track is 220 m. a path 7 m wide runs around the track. find the cost of fencing the outer circle at ruppes 2 per metre ​

Answer 1

Answer:

$2272 \: rs$

Step-by-step explanation:

circumference

$c = 2\pi \: r \\ 35 = 2 \times ( \frac{22}{7} ) \times r \\ r = 35m \\ area \: of \: circle = \pi {r}^{2} \\ = ( \frac{22}{7} ) \times {35}^{2} \\ = 3850 {m}^{2} \\ area \: of \: track = 3850 - \pi {(35 - 7)}^{2} \\ = 1386 {m}^{2} \\ cost \: of \: fencing \: = 2 \times 1386 \\ = 2772 \: rs$