SOLUTION: Find the length of a diagonal of a rectangle box whose edges are 3 inches, 4 inches, and 5 inches long. Thanks!

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Question 282030: Find the length of a diagonal of a rectangle box whose edges are 3 inches, 4 inches, and 5 inches long. Thanks!
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
First find the diagonal in the 3-4 plane, we'll call that G.
G%5E2=3%5E2%2B4%5E2=9%2B16=25
That diagonal (G) now becomes a leg along with the 5 inch leg.
Now find the diagonal, H, using the two legs, G and 5.
H%5E2=G%5E2%2B5%5E2=25%2B25=50
H=sqrt%2850%29=5%2Asqrt%282%29