Like all prisms you find the area of one of the triangular faces and then multiply by the height.
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Find the area of a triangular section, 1/2bh, and then multiply by the length of the prism.
To find the volume of a triangular prism, find the area of one of the triangles (base of the prism) first (base x height divided by 2). When you have the area of the triangle, then multiply the area of the triangle by the height of the prism, *not the height of the base.
1/2 x length x width x height
Volume = Area of the base X height of prism. This formula works for all prisms, not just triangular prisms. Area of a triangle = height of triangle X 1/2 X base of triangle.
Triangular prism