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##### Asked by: Samar Mendijurre

religion and spirituality astrology# Is a cone a polyhedron explain how you know?

**cones**, and spheres are not

**polyhedrons**, because they have curved, not flat, surfaces. A

**cylinder**has two parallel, congruent bases that are circles.A

**cone**has one circular base and a vertex that is not on

**the**base. A sphere is a space figure having all its pointsan equal distance from

**the**center point.

Similarly one may 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**.

**polyhedron**is simply athree-dimensional solid which consists of a collection of polygons,usually joined at their edges. The word derives from the Greek poly(many) plus the Indo-European hedron (seat). The plural of

**polyhedron**is "

**polyhedra**" (or sometimes"

**polyhedrons**").

Correspondingly, how do you know if something is a polyhedron?

Identifying Characteristic They don't have curved faces. The word 'faces' refersto the sides of the solid. So **if** all the sides of the solidare flat, then it is a **polyhedron**. But **if** the solidhas any curved sides at all, then it is not a**polyhedron**.

Thus a cylinder is **not a polyhedron** for severalreasons: 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 beworse!