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.
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If it's just the front surface of a box then it's simply a 2D shape, the area can be calculated by multiplying the length by the width. Answer will be in units squared.
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.
multiply the height by the width
You measure the sides, and multiply the top and side.
No. If you want the area of a single surface of a box, simply multiply the height by the width of the surface of interest.