A prism is a generic term used to describe a polyhedron with two parallel and congruent polygonal bases and a number of rectangles joining the two bases. The bases can also be curved, in which case they are joined by a curved surface.
The total surface area of a prism will be 2*area of base + perimeter of base*length of prism.
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It is simply called its surface area.
Assume that a = apothem length of the triangular prism, b = base length of the triangular prism, and h = height of the triangular prism. The formulas to find the surface area is SA = ab + 3bh.
To find the volume of a rectangular prism when given the surface area, we need more information than just the surface area. The surface area of a rectangular prism is calculated using the formula 2lw + 2lh + 2wh, where l, w, and h are the length, width, and height of the prism, respectively. Without knowing at least one of these dimensions, we cannot determine the volume of the prism.
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.
The surface area of a prism = 2 × area of base + perimeter of base × H