use the formula A = 1/2bh, where A = area, b = base, and h = height. Once you have the areas of all sides and faces, you simply add them together to get the surface area.
The formula would be depending on the triangular shape. Triangular prisms have their own formula for finding surface area because they have two triangular faces opposite each other. Which creates the formula A=12bh is used to find the area of the top and bases triangular faces, where A = area, b = base, and h = height.
