This depends on what unit you are using to measure in. However, area will always be measure in (unit)^2.
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You would use area. I would use the meter2. Okay
square units
The surface area of each side of the box ( there should be six sides unless it doesn't have a top ) added together will give you the total surface area. The surface area of one side is calculated by multiplying the length and the width. The answer will be in square inches or square centimeters depending on what unit of measure you use.
Square kilometres.
if you are after a metric measurement than millimetres^2