Okay, the last person who edited this, totally screwed up. The formula to find the surface area of a square prism is 2B+Ph, multiply the length of the width of the base to get the area, then multiply that by two. After you have multiplied the base twice, et the perimeter of the base and multiply it by the height of the square prism.
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If the cubic prism has length L, breadth B and height H, then its surface area is 2*(LB + BH + HL) square units.
If a rectangular prism has length L, width W and height H units, then its total surface area is 2*(LW + WH + HL) square units.
You will need to find the surface area of each face and add them together.
Surface Area = 2 × Base Area + Base Perimeter × Length