You find the area of each of the four triangular faces of the prism and add them together.
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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.
a triangular prism has to triangular bases while a rectangular prism has a rectangle as the bases.
A triangular prism
A triangular prism has two triangular faces, a rectangular prism does not have any.
A triangular prism.