Arithmetic Ability
Area

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Q.

Two concentric circles form a ring. The inner and outer circumferences of ring are  518/7m and 352/7 m respectively. Find the width of the ring.

View Answer

Correct choice: A

Explanation:

Let the inner and outer radii be r and R metres. Then 2πR=352/7=>R=352/7*7/22*1/2=8m 2πR=528/7=>R=528/7*7/22*1/2=12m => Width of the ring = (R - r) = (12 - 8) m = 4 m.
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