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Question

In fig. 3, the area of the shaded region is :

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A
π(r1+r2)
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B
π(r21+r22)
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C
π(r1r2)
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D
π(r22r21)
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Solution

The correct option is D π(r22r21)
The area of the given shaded region will be :
The area of the smaller circle subtracted from the larger circle
Area of larger circle is πr22 and
Area of smaller circle is πr21
Then, the ares of shaded region is πr22πr21=π(r22r21)

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