How to calculate the total square of a box with a height of 1.8m, a width of 0.8m and a thickness of 0.2m

Surface area: (1.8 × 0.8 + 1.8 × 0.2 + 0.8 × 0.2) × 2
Volume: 1.8 × 0.8 × 0.2

Specification: 70 * 45, 70 * 28 aluminum alloy, the wall thickness is 1 ~ 1.2mm, how much is the weight of aluminum alloy per meter? There are calculation methods, thank you
It's aluminum alloy doors and windows. It's used for decoration on the construction site. I just want to calculate. I was fooled by others when I entered the material

738kg / m for 70 × 45 and 0.626kg/m for 70 * 28: length + width - 2 times wall thickness × wall thickness × specific gravity △ 1000 = weight per meter

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