Two concentric circles form a ring. The inner and outer circumference of the rin

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Question
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.
Options
A. 5
B. 4
C. 3
D. 2

Correct Answer

4

Explanation

let the inner and outer radii be r and R meters
then, $2 ?r$ = 352/7

=> r = (352/7) * (7/22) * (1/2) = 8m
$2 ?R$ = 528/7

=> R= (528/7) * (7/22) * (1/2)= 12m
width of the ring = R-r = 12-8 = 4m

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