Find the diameter of circle whose area is twice of a circle of radius 21 cm
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area of the circle = 22/7 * 21 *21
=> 1386 cm^2
now since it is twice of the other circle =>
1386*2 => 2772cm^2
therefore radius => R^2= 2772*7/22 => 882
=> radius = 29.7 cm
=> 1386 cm^2
now since it is twice of the other circle =>
1386*2 => 2772cm^2
therefore radius => R^2= 2772*7/22 => 882
=> radius = 29.7 cm
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