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A circle of radius 5 cm is drawn and ...

A circle of radius 5 cm is drawn and another circle of 3 cm radius is cut out of this circle. What is the radius of a circle which has the same area as the area of the bigger circle excluding the cut one? (a) 2 cm      (b) 3 cm      (c) 4 cm      (d) 4.5 cm

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