A triangular prism has both area and volume; it is therefore a type of pentahedron. The volume of a triangular prism is found by calculating the area of the triangular base using a = 1 / 2 (b * h), and multiplying the result with the length (l) of the rectangular sides. The base of a prism is typically used to identify the type of prism, with the triangular prism being named after its triangular base.

Other prisms such as the rectangular prism, the square prism and the pentagonal prism are all named according to the shapes of their bases. The number of faces that a prism has is easily determined by counting the number of sides of its base and then adding 2, which is typically represented using the formula n + 2.

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