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Many, an unspecified number. Poly, in Greek, means many. Polyhedra (singular polyhedron) means "many faced".

Q: How many faces on a polyhedra?

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Bipyramids are a class of polyhedra with more faces than vertices.

There are many. All polyhedra have ONLY flat faces but many other shapes have flat faces such as a hemisphere or an octant or a cylinder.

Regular polyhedra have identical faces.

There are infinitely many polyhedra all of whose faces are triangular.

The simplest stellated polyhedral shape is the stellated tetrahedron with 12 faces (3 * 4) Others have more faces.

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They are called "faces".

Bipyramids are a class of polyhedra with more faces than vertices.

There are infinitely many polyhedra with one or more triangular faces.

There are many. All polyhedra have ONLY flat faces but many other shapes have flat faces such as a hemisphere or an octant or a cylinder.

There are a few families of polyhedra with identical faces. There are none whose faces have 6 or more sides. There is no special name for polyhedra whose faces are pentagons or pentagrams. A dodecahedron is an example. If coplanar faces are disallowed, the only polyhedron with quadrilateral faces are the cube and rhombohedron. There are infinitely many polyhedra with equilateral triangular faces: the tetrahedron, octahedron and icosahedron are examples.

Regular polyhedra have identical faces.

There are infinitely many polyhedra all of whose faces are triangular.

The simplest stellated polyhedral shape is the stellated tetrahedron with 12 faces (3 * 4) Others have more faces.

A cube, a dodecahedron, an icosahedron amongst regular polyhedra. Many irregular polyhedra, including a prism.

10 * * * * * Polyhedra are named according to the number of faces that they have. So a 3d dodecagon, called a dodecahedron would have 12 faces.

There are infinitely many such polyhedra. A regular dodecahedron, for example.

There are infinitely many polyhedra. There is no limit to the number of faces that a polyhedron can have. Given any polyhedron, simply cut off one vertex so that you will have a polyhedron with one more face. Also there are several versions of polyhedra with the same number of faces. A hexahedron, for example, can be a parallelepiped or a pentagon based pyramid or a triangular based dipyramid.