You will need to find the surface area of each face and add them together.
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Surface Area = 2 × Base Area + Base Perimeter × Length
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.
It is not possible. For example, the prism could be tall and thin, or short and thick, and either way have the same surface area.
You cannot.
You can find the exact surface area for all of those shapes.