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.
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Using Pythagoras: 10 times square root of 2 feet
A 9 x 12 rectangle has a diagonal of 15.
The base is 24 cm x 18 cm. By Pythagoras, the diagonal of the base is sqrt(242 + 182) = sqrt(576 + 324) = sqrt(900) = 30 cm
A box has no equation. There are different equations for its volume, its surface area, the longest (principal) diagonal.
Use Pythagoras: Diagonal² = √(2 × sidelength²) → diagonal = side_length × √2 → diagonal = 20 × √2 ≈ 28.3 units