SOLUTION: If a circle's area increases in the ratio 81:49, wthat ratio has the radius increased by?

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Question 990732: If a circle's area increases in the ratio 81:49, wthat ratio has the radius increased by?
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
Area is a function of the square of the radius.
The ratio of the radius has increased by 9:7, and the square of that (area) would be 81:49