The circumferences of two concentric circles are 176 m and 132 cm respectively.

Question

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

Options:

A . 5 m

B . 7 m

C . 8 m

D . 44 m

Answer: Option B

=> 2Ï€R-2Ï€r = (176 - 132)
=> 2Ï€ (R - r) = 44
=> (R - r) = (44Ã—7)/(2Ã—22) = 7 m

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