A tetrahedron or triangular pyramid.
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a triangle- based pyramid has 4 faces
A tetrahedron or triangular pyramid.
A triangular based pyramid has 4 faces, 6 edges and 4 vertices.
A pyramid is usually a 4 sided figure but a cuboid is not. Also, the 4 sided pyramid all the faces are triangle but the cuboid has 2 square faces and 4 rectangle faces
A square pyramid has 5 faces. It has 1 square face and 4 triangle faces.