document.write( "Question 382252: find the length of the diagonal of a cube if each side of the cube is 3 feet long? \n" ); document.write( "
Algebra.Com's Answer #270973 by Alan3354(69443)\"\" \"About 
You can put this solution on YOUR website!
The diagonal of each face = 3sqrt(2)
\n" ); document.write( "\"df+=+sqrt%283%5E2+%2B+3%5E2%29+=+sqrt%2818%29\"
\n" ); document.write( "Across 2 opposite vertices of the cube, it's:
\n" ); document.write( "\"d+=+sqrt%283%5E3+%2B+18%29+=+sqrt%2827%29\"
\n" ); document.write( "\"d+=+3sqrt%283%29\" feet
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