The exact answer will depend on what information you have. But generally speaking,
Surface area = Perimeter of cross section x Length
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LxWx2
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?
yes. base area x height lxwxh No. Above answer gives volume not surface area. Surface area formula will differ depending on type of prism.
Surface Area = 2 × Base Area + Base Perimeter × Length
S=2B+Ph