A tetrahedron or triangular pyramid.
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A triangular pyramid.
A triangular based pyramid has 4 faces and 4 vertices
A tetrahedron or triangular-based pyramid has four faces, six edges, and four vertices.
The number of vertices on a solid pyramid will depend on its base as for example if it is a triangular based pyramid (tetrahedron) then it will have 4 vertices, 6 edges and 4 faces.
pyramid