SOLUTION: The radius of a sphere is increased by 10%, the surface area increases by?

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Question 986212: The radius of a sphere is increased by 10%, the surface area increases by?
Answer by ikleyn(52782) About Me  (Show Source):
You can put this solution on YOUR website!
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If   r%5B2%5D%2Fr%5B1%5D = 1.1,   then   S%5B2%5D%2FS%5B1%5D = %28r%5B2%5D%2Fr%5B1%5D%29%5E2 = 1.1%5E2 = 1.21.