We can use the 3D Pythagorean theorem for this:
Diagonal length = $\sqrt{(15^2 + 20^2 + 25^2)}$
Diagonal length = $\sqrt{(225 + 400 + 625)}$
Diagonal length = $\sqrt{1250}$
Now, let's find the angles the diagonal makes with the edges of the box. We can use the
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