You multiply the length times the with.
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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.
You find the volume of a triangular prism by using this formula: Volume = 1/2 base of the triangle x height of the triangle x height of the prism.
One half base times height of the triangle times length of the prism.
You Multiply Thee Lenqqthhh Timess thee Widthh. ! ":DD
You find the area of each of the four triangular faces of the prism and add them together.