Using Pythagoras: 10 Times Square root of 2 feet
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Approximately 15.62 feet.
It depends on what the 7' and 10' refers to. They could be adjacent sides of a rectangle or a parallelogram. If the latter, more information is required before the question can be answered.
A box is a 3-dimensional object and only two measures are given so it is not clear what the question means. Across the base of the box, the diagonal is 10*sqrt(2) = 14.142 approx.
10 feet*10 feet=100 square feet
18.9 feet