SOLUTION: If the surface area of a sphere is 86*pi ft^2, what is its diameter? I get 2*square root of 21.5 ft., but my answer key says the answer is the square root of 86 ft. How did they

SOLUTION: If the surface area of a sphere is 86pi ft^2, what is its diameter? I get 2square root of 21.5 ft., but my answer key says the answer is the square root of 86 ft. How did they

Question 23470: If the surface area of a sphere is 86*pi ft^2, what is its diameter? I get 2*square root of 21.5 ft., but my answer key says the answer is the square root of 86 ft. How did they get that?
Thanks.
Debby
Answer by Earlsdon(6294) (Show Source): You can put this solution on YOUR website!
The formula for the surface area of a sphere is:
Where D is the diameter of the sphere.
Divide both sides by
Take the square root of both sides.
ft.
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