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  1. The circumferences of two concentric are 176 m and 132 m respectively. what is the difference between their radii ?
    1. 5 meter
    2. 7 meter
    3. 8 meter
    4. 44 meter
Correct Option: B

∵ 2πR - 2πr = (176-132)
⇒ 2π(R-r) = 44
⇒ R-r = ( 44 x 7 )/ (2 x 22)
= 7 m


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