Question

A race track is in the form of a circular ring whose outer and inner circumferences are 396 m and 352 m respectively. The width of the track is ____________.

विकल्प

• 63 m

• 56 m

• 7 m

• 3.5 m

Answer 1

A race track is in the form of a circular ring whose outer and inner circumferences are 396 m and 352 m respectively. The width of the track is 7 m.

Explanation:

let the radius of inner track = r

`2 pi "r" = 352`

`"r" = 56`

let the radius of outer track = R

`2 pi "R" = 396`

`"R" = 63`

width of track = radius of outer track - radius of inner track

`= 63 - 56`

`= 7  "m"`