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50. There are two concentric circles of radii 3.5 cm and 7 cm . A third concentric circle is drawn outside the 7 cm circle so that the area enclosed between it and the 7 cm circle is same as that between two inner circles. Find the radius of the third circle.

Answer» 50. There are two concentric circles of radii 3.5 cm and 7 cm . A third concentric circle is drawn outside the 7 cm circle so that the area enclosed between it and the 7 cm circle is same as that between two inner circles. Find the radius of the third circle.


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