Pyramid - they have three sides and a base = four faces
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A triangular based pyramid has four vertices and four faces
tetrahedron
A tetrahedron has four faces and vertices.Faces: 4Vetices: 4Edges: 6
A tetrahedron has 4 vertices and 4 faces.
There is no such shape - unless there are other faces. If there is one rectangular face then you require at least four other faces - one on each edge of the rectangle - making a minimum of 5 faces.