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.

let the inner and outer radii be r and R meters
then,  $2\mathrm{\pi r}$ = 352/7

=> r = (352/7) * (7/22) * (1/2) = 8m
$2\mathrm{\pi R}$ = 528/7

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