A triangular based pyramid has 4 faces 6 edges and 4 vertices
Triangular pyramids are also called tetrahedra.
Any one of the four faces can be a base.
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A triangular based pyramid which is a tetrahedron has 4 faces, 6 edges and 4 vertices
A triangular based pyramid has 4 faces, 6 edges and 4 vertices.
five A triangular based prism has 5 A triangular based pyramid has 4 and there is no such thing as a triangular based prism pyramid - unless you mean a truncated pyramid (or a frustum) which is essentially a prism.
A triangular based pyramid has 4 facxes, 4 vertices and 6 edges
A triangular-based pyramid, also called a tetrahedron, has no parallel faces, but has 4 faces, 6 edges and 4 vertices