triangles
because TRIangular prism pyramid means that TRIangles are the bases, which also mean the faces.
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a triangular pyramid.
If the base of the pyramid is a triangle then all its faces would be triangular in shape.
A regular tetrahedron (triangular pyramid).
A 3D shape with all triangular faces can be a tetrahedron pyramid.
3d shape Well actually it is a Cube