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if the circumference of a circle increases from 4 pie to 8 pie, then its area is ?

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Increase by 4 times..
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16pi as its radius is 4
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area increase by 16 times.
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the radius of the wheel is .25m. the number of revolutions it will make to travel a distance of 11 km. will be ? if the perimeter of a circle is equal to that of a square, then the ratio of their area is ?