Surface Area= 2(lw+lh+wh)
Volume= lwh
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The formula is Bxh where B is the base which is the area of the triangle and h is the height of the prism.
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.
The fact that it's a prism has nothing to do with the area of the base. See the attached Related Link for your formula.
triangular prism- formula: Abh(area of the base * height)