The formula is Bxh where B is the base which is the area of the triangle and h is the height of the prism.
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triangular prism- formula: Abh(area of the base * height)
The answer depends on the formula for what characteristic of the prism.
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.
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.
2*area of triangular base + perimeter of triangle*length of prism.