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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?
Assuming you mean a rectangular prism, you get the smallest surface area if the prism is a cube. You can calculate the required length of side to get that volume; then, based on that, the corresponding surface area.
You mean a rectangular prism? Like a block of lego? Then you just need to work out the surface area of the four sides, which will be two pairs of identical rectangles. So; ((L*W)+(W*D))*2 L ______|______ / /| /____________/ |-D | | | | | / |____________|/ \ W
A prism can have a triangular cross-section with a rectangular base
Assuming you mean a regular prism, 3 rectangular sides and 2 triangular sides, you need only know how to calculate the area for rectangles and triangles and then sum the values for the 5 individual faces.