The inner circumference of a circular race track, 14m wide is 440m. Find the radius of the outer circle.
Solution
Correct Answer: Option A
let inner radius be r meters.
\(\begin{array}{l}2\mathrm{πr}=440\Rightarrow\mathrm r=\left(440\times\frac7{44}\right)=70\mathrm m\\\mathrm{radius}\;\mathrm{of}\;\mathrm{outer}\;\mathrm{circle}\;=\left(70+14\right)\mathrm m\end{array}\)
Therefore, Radius of outer circle = 70 + 14 = 84m
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