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.
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You find the area of each of the four triangular faces of the prism and add them together.
It depends on the size of the triangular prism, but depending on the side of the prism you use the triangle area formula to find it or the rectangle area formula to find it.
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.
triangular prism- formula: Abh(area of the base * height)
you calculate the area of one side, then multiply it by three.