SOLUTION: What is the radius of a cone that has Surface Area of 219.91 in^2 and a slant height of 9 in? I set up the problem: 219.91=(PI)r^2 + 9(PI)r I can't figure out the steps to s

Question 732603: What is the radius of a cone that has Surface Area of 219.91 in^2 and a slant height of 9 in?
I set up the problem: 219.91=(PI)r^2 + 9(PI)r
I can't figure out the steps to solve this problem. I think I am missing information?
Answer by KMST(5328) (Show Source): You can put this solution on YOUR website!
--> --> (rounding)
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You can solve that quadratic equation easily by factoring:
--> --> because does not make sense.
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