Q: Cylinders and cones are just polyhedrons with circular bases?

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A polyhedron is defined as a "geometric solid in three dimensions with flat edges and straight faces". As both cylinders and cones have curved faces, neither are polyhedra.

A circular cross-section.

cones have round bases

Spheres, cones and cylinders have no perpendicular faces that meet each other at right angles.

The sun moon and other planets are spheres. Pine trees are cones. Tornadoes are upside down cones. The trunks of some trees and the stems of some plants are cylinders.

Related questions

Cones, cylinders.

polyhedrons need flat face and edges, corners which cylinder cones don't have.

A polyhedron is defined as a "geometric solid in three dimensions with flat edges and straight faces". As both cylinders and cones have curved faces, neither are polyhedra.

Yes. And Its Do All Cones Have Circular Bases.

circumference rather than perimeter

A circular cross-section.

They have at least one circular base.

polyhedrons need flat face and edges, corners which cylinder cones don't have.

round,circular, 3-D shapes

no because it has curved faces.

Similar: They both have a circular base.Different: A cone has a vertex, a cylinder does not.

polygons have faces and cylinders and cone and spheres only has bases not faces.