SOLUTION: If the box is 12 inches long, 4 inches wide and 3 inches high, then what is the length of the diagonal?

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Question 383225: If the box is 12 inches long, 4 inches wide and 3 inches high, then what is the length of the diagonal?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let d = diagonal
d%5E2+=+12%5E2+%2B+4%5E2+%2B+3%5E2 (in in2)
d%5E2+=+144+%2B+16+%2B+9
d%5E2+=+169
d+=+sqrt%28169%29
d+=+13 in