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Q.

The radii of two concentric circles are 68 cm and 22 cm. The area of the closed figure bounded by the boundaries of the circles is

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a

$4080 π sq. cm.$

b

$4140 π sq. cm.$

c

$4050 π sq. cm.$

answer is A.

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Detailed Solution

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$∴$ Required Area $= (π (68)^{2} - π (22)^{2})$

$\Rightarrow (4624 π - 484 π) \Rightarrow 4140 π {cm}^{2}$

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