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A pyramid.
It is a pentahedron with a rectangular base and four triangular lateral faces.
A pyramid
A triangular prism has two congruent triangular bases in parallel planes and three rectangular faces joining them together. A triangular pyramid has four triangular faces, a triangular base and three triangular faces meeting at an apex above the base. Triangular prism: 6 vertices, 5 faces, 9 edges Triangular pyramid: 4 vertices, 4 faces, 6 edges
A triangular pyramid has four triangular faces.