1.

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

Answer»

Let the inner and outer radii be r and R metres. 

Then 2πr = (352/7) 

r =((352/7) X (7/22) X (1/2)) =8 m. 

2πR=(528/7) 

R=((528/7) x (7/22) x (1/2)) = 12 m. 

Width of the ring = (R - r) = (12 - 8) m = 4 m



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