Two concentric circles form a ring. The inner and outer circumference of the ring are 352/7 m and 528/7m respectively.Find the width of the ring.
Solution
Correct Answer: Option B
let the inner and outer radii be r and R meters
then, \(2\mathrm{πr}\)
= 352/7
=> r = (352/7) * (7/22) * (1/2) = 8m
\(2\mathrm{πR}\)= 528/7
=> R= (528/7) * (7/22) * (1/2)= 12m
width of the ring = R-r = 12-8 = 4m
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