Solution:
Remember that the surface area of a sphere with radius r is given by the following formula:
[tex]SA\text{ = 4}\pi\text{r}^2[/tex]then, if the radius triples, that's a factor of 3. The square of 3 is 9, so if the radius triples the area is multiplied by 9.
Then the surface area will increase by a factor of 9.
