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The area between two concentric circles will be :(A) πR2(B) π (R + r)(R – r)(C) π(R2 – r)(D) None of these |
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Answer» Answer is (B) π (R + r)(R – r) = πR2 – πr2 = π(R2 – r2) = π (R + r)(R – r) |
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