the circumference of two concentric circles are 121cm and 154cm calculate the difference between their radii
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case 1 : circumference: 121cm
2πr = 121
r= 121*7/2*22
r= 77/4cm
r= 19.25 cm.......(1)
case 2: circumference= 154 cm
2πr' = 154
r' =154*7/22*2
r'= 24.5cm.........(2)
subtract (1) from (2)
such that the difference between their radius is = r' - r
= (24.5 - 19.25)cm
=5.25 cm
therefore the answer is 5.25 cm
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