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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.

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. Correct Answer 4

let the inner and outer radii be r and R metersthen, 2πr = 352/7

 

=> r = (352/7) * (7/22) * (1/2) = 8m2πR = 528/7

 

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

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