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**polyhedron**impliesthat each side is a piece of a flat surface. In the same way, thefaces of a

**polyhedron**(a three-dimensional figure) have tobe planes with straight edges, A cylinder and a

**cone**aretherefore

**not**considered to be

**polyhedra**because theyhave curved surfaces.

People also ask, is a cone a polyhedron?

The faces of the polygon are known as "polygons" becausethey contain straight sides. It is known that the **polyhedron**is bounded by the "straight lines" and due to the "curved surfaces"of a **cone**. The solid which contains a base like circle andcurved surface with single vertex is called**cone**.

**polyhedra**build a zoo difficult to conceive,so rich is it. Thus a

**cylinder**is

**not**a

**polyhedron**for several reasons: its lateral surface is

**not**plane, its bases are

**not**polygons, finally it has

**no**vertex!

**No**faces,

**no**edges,

**no**vertices, it couldn't be worse!

Beside this, what is not a polyhedron?

There are no gaps between the edges or vertices in a**polyhedron**. Examples of **polyhedrons** include a cube,prism, or pyramid. **Non**-**polyhedrons** are cones,spheres, and cylinders because they have sides that are **not**polygons.

Two of them are **flat** while the third one iscurved. **Cone** has 2 faces. One of them is **flat** andcircular while the other is curved. **Cone** has one circularedge and one vertex.