It depends on how many sides are part of the "opening".
2(l*w)+2(w*h)+2(l*h)=surface area
LxWx2
surface area of a rectangular prism is the formula: 2lw+2wh+2lh
W = Volume x weight density
I am not sure that a rectangular prism is in any position to care!
its not i dont no why
Formula: S = 2B + L
There must be a typo in this question, "Why does the formula for finding the surface area of arectangular prism is helpful?" What does that even mean?
The formula will depend on what it is that you are trying to find: the volume or the surface area.
Surface area = 2LW + 2(L+W)H
Depends whether you want the formula for surface area, volume, perimeter, size of sphere it would fit into etc... Please clarify next time.
The formula for finding the surface area of a rectangular prism is 2(wh + lw + lh), where w is width, h is height, and l is length. 3.14 is the value for pi, which is only used for circular objects, like circles, cylinders, and spheres. It has nothing to do with rectangular prisms. Click on the related link below for an illustration of the formula for the surface area of a rectangular prism.