SOLUTION: surface area of a sphere is 56 centimeters squared. find radius?

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Question 456258: surface area of a sphere is 56 centimeters squared. find radius?
Answer by MathLover1(20849) About Me  (Show Source):
You can put this solution on YOUR website!

The surface area of a sphere of radius 'r' is given by:
surface_+area+=+4%28pi%29r%5E2

r%5E2=surface_+area%2F4%28pi%29

r%5E2=56+cm%5E2%2F4%283.14%29

r%5E2=56+cm%5E2%2F12.56

r%5E2=4.5cm%5E2

r=sqrt%284.5cm%5E2%29

r=2.1213203435596425732025330863145cm%29
or approximately
r=2.12cm%29