Radius of a circle is doubled. What will be the ratio of areas of the new circle to the area of the given circle?

2:3

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4:8

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4:1

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5:3

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Solution

The correct option is C
4:1

Area of a circle is proportional to the square of the radius hence if the radius is doubled, area becomes 4 times.

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Radius of a circle is doubled. What will be the ratio between the area of the new circle and the area of the original circle?

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