1.

The area between two concentric circles will be :(A) πR2(B) π (R + r)(R – r)(C) π(R2 – r)(D) None of these

Answer»

Answer is (B) π (R + r)(R – r)

= πR2 – πr2

= π(R2 – r2)

= π (R + r)(R – r)



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