The inner circumference of a circular race track, 14 m wide is 440 m . Then the

Question

The inner circumference of a circular race track, 14 m wide is 440 m . Then the radius of the outer circle is?

Options:

A . 77 m

B . 84 m

C . 56 m

D . 70 m

Answer: Option B

Circumference of a circular = 2?r? 2 x (22 / 7) x r = 440? r = [440 x (7/22) x (1/2)] = 70 m? Radius of outer circle = (70 + 14) m = 84 m

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