To find the surface area of a rectangular prism, find the area of each of the faces, then add it all up. The formula is 2(lw)+2(lh)+2(wh).
For example, a rectangular prism with a length of 4, a height of 3, and a width of 2 has a surface area of 52 units squared.

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Volume

To find the volume of a rectangular prism, multply the length, the width, and the height. The formula is lwh.
For example, a rectangular prism with a length of 4, a height of 3, and a width of 2 has a volume of 24 units cubed.