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If the radius of a circle becomes twice then the ratio of any of the old and new circle will be

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If the radius of a circle becomes twice then the ratio of any of the old and new circle will be

(a) 1 : 2

(b) 1 : 4

(c) 4 : 1

(d) 2 : 1

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If the radius of a circle becomes twice then the ratio of any of the old and new circle will be 4 : 1

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