find the area enclosed between two concentric circles of radii 3.5cm and 7 cm.a third concentric circle is drawn outside the 7cm circle so that the area enclosed between it and the 7cm circle is the same as that between the two inner circles.find the radius of the third circle.
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Areae bounded by 7cm and 3.5 cm circles = 115.5cm² ...
Length of bigger radius = 9.26 cm
Length of bigger radius = 9.26 cm
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