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Mathematics 8 Online
OpenStudy (anonymous):

If a spherical ball is enlarged so that its surface area is 9 times greater than its original surface area, then the original radius was multiplied by _________

jimthompson5910 (jim_thompson5910):

Hint: In general, if each dimension of a solid is multiplied by k, then the surface area will increase by k^2 (where k is some number greater than 1)

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