Just one: a tetrahedron or triangular pyramid.
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Tetrahedron - basic to theory of chemical bonds and one of the classic Platonic solid shapes
The most common pyramid shapes have 3 faces on a triangular base or 4 faces on a square face. Other pyramid shapes may have more faces corresponding to the shape of the base.
Some of the basic 3D shapes are:spherecubecuboidcylinderrectangular prismtriangular prismhexagonal prismconesquare-based pyramidtriangular-based pyramidhexagonal pyramidThere are an unlimited number of 3d shapes. These are called polyhedrons, and their names are from the Greek word for the quantity (number) of faces (sides) on each shape. All faces are exactly the same as each other on regular polyhedrons; one or more faces are different from the other faces on irregular polyhedrons. A few of the countless number of polyhedron names, with the name following the number of faces on the 3d shape are:4 tetrahedron (a regular tetrahedron is a pyramid with 3 sloping sides and a base)5 pentahedron (a regular pentahedron is a pyramid with 4 sloping sides and a base)6 hexahedron (a regular hexahedron is a cube, having 4 sides, a top, and a base)10 decahedron12 dodecahedron24 icositetrahedron90 enneacontahedron
No 3D shape with FLAT SIDES has exactly 3 faces. 4 is the minimum.
Actually, there is such thing as a polyhedron. Its a 3D shape and it's faces are all the same shapes. Doesn't matter what shape, actually. ^^^ ok, to the dude who answered before me (above): you're a butt... you didn't answer the freaking question! Its 6