In any case, the perimeter of a rectangular prism of length L units, width W units and height H units, is
4*(L + W + H) units
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Because it is a rectangular prism and it has volume and area also mass and perimeter
Add up all of the lengths of the edges adjacent to one of the bases.
Perimeter is not defined for 3-dimensional objects.
Depends whether you want the formula for surface area, volume, perimeter, size of sphere it would fit into etc... Please clarify next time.
Perimeter = 2 x (length+width). You add the length to the width and multiply the sum by two.