The inner circumference of a circular race track, 14 m wide, is 440 m. Find radius of the outer circle
Correct Answer: Option D
Let inner radius be r metres. Then, 2\(\mathrm\pi\)r = 440 ; r = \(440\times\frac7{44}\)
= 70 m.
Radius of outer circle = (70 + 14) m = 84 m
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