The circumference of two concentric rings is 88 cm and 66 cm respectively. Then the width between the rings is

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14 cm

3.5 cm

10.5 cm

5 cm

answer is A.

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Detailed Solution

Circumference of other ring $2 π R_{1} = 88$ cm

Circumference of inner ring $2 π R_{1} = 66$ cm

$∴ 2 π R_{1} = 88$

$2 \times \frac{22}{7} \times R_{1} = 88$

$R_{1} = 88 \times \frac{7}{44}$

$R_{1} =$ 14 cm

$2 π r_{1} = 66$

$2 \times \frac{22}{7} \times r_{1} = 66$

$r_{1} = 66 \times \frac{7}{44}$

$r_{1} = \frac{21}{2} =$ 10.5 cm

Width of a rings $=$ $14 - 10.5$ cm $=$ 3.5cm

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