It would be one box.
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If those are feet, and you are talking about a rectangular box, then just multiply the numbers. If the numbers are any other unit (and you are still talking about a rectangular box), then convert each of the numbers to feet first.
Rectangular Box?
A rectangular prism has six faces. All the faces are rectangles. For Example: A ceral box...a cabnet...a shoe box/tissue box...
a rectangular prisim is part of geometry, its shape is like a tissue box
I just call it a box or brick or block