Question
Surface area of a sphere is 2464`cm^2`. If its radius be doubled,then he surface area of the new sphere will be :
Answer: Option B
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Let the original radius be r.
Then ,original surface area = `4 pi r^2 = 2464` cm2 (given )
New radius = 2 r
`:.` New surface area = `4 pi (2 r)^2 = 4 xx 4 pi r^2 = ( 4 xx 2464) cm^2 = 9856 cm2`
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