In geometry, a triangular prism is a cylinder with a triangular bottom. Regular triangular prism is a semi-regular polyhedron and a uniform polyhedron. A triangular prism is a pentahedron with a set of parallel faces, that is, two faces are parallel to each other.

While the normals of the other three surfaces are on the same plane (not necessarily parallel planes). These three faces can be parallelograms. All cross sections parallel to the bottom are the same triangle.

Properties of triangular prism;

1, all sides are equal, and the sides are parallelogram.

2. The sections of the two bottom surfaces and parallel to the bottom surfaces are congruent polygons.

3. The section through two non-adjacent sides is a parallelogram.

4. Under the condition of a certain cross-sectional area and length, the longitudinal supporting force of a triangular prism-shaped object is the largest, and the transverse bearing capacity is the smallest (the transverse stress makes the object produce tensile stress, while the longitudinal compressive stress has a reinforcing effect on the object in theory, but the tensile stress is the opposite).

5. Prism volume = bottom area × height.