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Q: Why aren't cylinder cones and spheres polyhedrons?

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

False. Cylinders and cones are not just polyhedrons with circular bases.

no because it has curved faces.

These could be called solids.There are lots of three dimensional shapes. Cubes, spheres, cylinders, cones, toroids, pyramids, helixes, the various polyhedrons..

false

The answer depends on information which has not been provided: the height of the cylinder and cone will affect their surface areas.

you do stuff

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

That depends upon the relative sizes of the cones and the cylinder.

A circular cross-section.

No, only on shapes with circles such as cones and spheres.

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.

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