None, but you can cut a cube into any number ≥ 2 of triangular prisms.
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there is no rght agles in a triangular prisms
No, Triangular prisms have two bases that are triangular but these need not be equilateral.
There's the rectangular prism, the triangular prism, hexagonal prism, pentagonal prism, the cube, and the octagonal prism.
Triangular prisms.
Triangular Prisms don't have any vertical edges