SOLUTION: find the length of the diagonal of a cube if each side of the cube is 3 feet long?

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