The circumferences of two concentric are 176 m and 132 m respectively. what is the difference between their radii?

Question

Accepted Answer

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

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