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

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Question
The inner circumference of a circular race track, 14m wide is 440m. Find the radius of the outer circle.
Options
A. 84m
B. 24m
C. 44m
D. 54m

Correct Answer

84m

Explanation

let inner radius be r meters.

$2 ?r = 440 ? r = (440 � \frac{7}{44}) = 70 m radius of outer circle = (70 + 14) m$

Therefore, Radius of outer circle = 70 + 14 = 84m

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