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

5 meter
7 meter
8 meter
44 meter

Correct Answer: 7 meter

Explanation:

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

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