There are infinitely many polyhedra all of whose faces are triangular.
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trianglesbecause TRIangular prism pyramid means that TRIangles are the bases, which also mean the faces.
If the base of the pyramid is a triangle then all its faces would be triangular in shape.
Triangular based pyramid
A triangular pyramid has four faces, and is referred to as a tetrahedron if the faces ale all equilateral triangles.
at the top, the apex