SOLUTION: The Surface Area of a Sphere is 86pie ft squared. What is the diameter of th sphere?

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Question 100031This question is from textbook
: The Surface Area of a Sphere is 86pie ft squared. What is the diameter of th sphere? This question is from textbook

Answer by elima(1433) About Me  (Show Source):
You can put this solution on YOUR website!
SA=4%28pi%29r%5E2
86%28pi%29ft%5E2=4%28pi%29r%5E2
divide each side by %28pi%29, then the %28pi%29cancels;
86ft%5E2=4r%5E2
divide each side by 4;
86%2F4=r%5E2
21.5=r%5E2
sqrt%2821.5%29=sqrt%28r%5E2%29
4.64=r
diameter = 2(4.64)=9.28
:)