document.write( "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?\r
\n" ); document.write( "\n" ); document.write( "Thanks.\r
\n" ); document.write( "\n" ); document.write( "Debby \n" ); document.write( "

Algebra.Com's Answer #12260 by Earlsdon(6294) $\"\"$ $\"About$

You can put this solution on YOUR website!
The formula for the surface area of a sphere is:
\n" ); document.write( " $\"S+=+%28pi%29D%5E2\"$ Where D is the diameter of the sphere.\r
\n" ); document.write( "\n" ); document.write( " $\"%28pi%29D%5E2+=+86%28pi%29\"$ Divide both sides by $\"%28pi%29\"$
\n" ); document.write( " $\"D%5E2+=+86\"$ Take the square root of both sides.
\n" ); document.write( " $\"D+=+sqrt%2886%29\"$ ft. \n" ); document.write( "

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