Question

4. A race track is in the form of a ring whose inner and
outer circumference are 352 meter and 396 meter
respectively. Find the width of the track.
(a) 7 meters
(b) 14 meters
(c) 147 meters (d) 71 meters​

Answer 1

Let the radius of the inner track = r.

Circumference of inner track = 352.

2πr = 352

=> 2 * 22/7 * r = 352

=> 44/7 * r = 352

=> r = 56 m

Let the radius of the outer track = R.

Circumference of outer track = 396.

=> 2πR = 396

=> 2 * 22/7 * R = 396

=> 44R/7 = 396

=> R = 63 m

Thus,

Width of the track = 63 - 56 = 7 m.

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