Question
If the radius of a sphere is doubled , how many times does its volume become ?
Answer: Option D
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Let the original radius be r. Then original volume = `4/3 pi r^3`
New radius = 2 r
`:.` New volume = `4/3 pi (2r)^3 = 8 xx 4/3 pi r^3` = 8 x original volume.
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