lengh x width x height
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you do length times width
You cannot "calculate" the front of a box. You can calculate its dmensions, or its area but calculating it does not make sense. As for calculating its size or area, the answer will depend on what information you have and what you require.
area of an box is length x width.
The front surface of a box is a rectangle. If you only need the area of the front surface, then it doesn't even matter what it's part of. Multiply the width of the surface by its height. The answer is its area.
No. A rectangle is a 2-dimensional shape. Each face of a box may well be a rectangle but the box, itself, is probably a cuboid.