The inner circumference of a ring is 66m The width of ring is 7m . Find the circumference of outer surface
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let circumference of C1 = 2πr1
2πr1= 66
2*22/7*r1=66
r1= 66*7/44
r1=10.5
radius of outer ring = r1 +width
= 10.5+7= 17.5m
circumference= 2πr2= 2* 22/7*17.5
=110 m
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