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The area of the circle with radius y is ...

The area of the circle with radius y is w. THe difference between the area of the bigger circle (Wit radius y) and that of smaller circle (with radius x) is w' `So,frac(X)(y) is equal to (A) `sqrt(1-frac(w')(w)` (B) `sqrt(1+frac(W')(w)` (C) `sqrt(1-frac(w)(w')` (D) `sqrt(1+frac(W)(w')`

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