It is rectangular
A triangular prism can have a square or triangular base.
the base of a triangular pyramid is triangle
the base of a triangular pyramid is triangle
A triangular prim has 5 faces, 6 vertices and 9 edges. A base is the same as a face.
If it is a pyramid, then the base shape is a SQURE. If it is a tetrahedron, then the base shape is a triangle.
Triangular Pyrimid
A triangular prism can have a square or triangular base, but faces are normally triangles. (I think)
That would be a triangular pyramid.
It is a pyramid
It is normally rectangular in shape.
Triangular Pyramid
Tetrahedron