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Tetrahedron
1. triangular prism it has 2 triangular faces. 2.triangular base pyramid, it has 5 triangular faces. 3. square base pyramid, it has 4 triangular faces.
pyramid
Tetra = four. It is a 3-d shape with 4 faces.
A vertex is the name of a corner on a solid where three or more faces meet (plural = vertices).