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Bunuel
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Bunuel
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spetznaz
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nust2017
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Can anyone please explain why we subtracted 9π- 4π if we wanted to find the total area of the ring? Shouldn't we be adding these two to find the total area which is the inner circle plus the outer circle?

Thanks in advance.
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RenanBragion
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I think this is a high-quality question and I agree with explanation.
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