The inner circumference of a circular race track Is 440m. If the width of track is 14m, what is the radius of outer circle?
- 70m
- 77m
- 84m
- None of these
Explanation
Circumference of inner circle = 2πr1 = 440m
=> r1 = 440 / (2π) = 70m
The radius of the outer circle will be the radius of the inner circle plus the width of the track.
Radius of outer circle (r2) = r1 + width of the track
r2 = 70m + 14m = 84m
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