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Are cones and cylinders polyhedra

Updated: 4/28/2022
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12y ago

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No. They have curved edges, so they can't be polyhedra.

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12y ago
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Q: Are cones and cylinders polyhedra
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Related questions

Why are cylinders and cones not considered to be polyhedrons?

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.


Why are cylinders and cones not considered to be a polyh?

Polyhedra are 3-dimensional shapes bounded by polygons. Polygons are flat [plane] shapes bounded by straight lines. So a polyhedron cannot have any curved faces.


Can polyhedra objects roll?

Strictly speaking, no. But, as the number of faces increases, polyhedra can approximate cylinders or spheres and so can "roll".


Cylinders and cones are just polyhedrons with circular bases?

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


What is the fomula of volume?

There is no universal formula for volume: it depends on the shape. There are formulae for the volumes of some shapes such as cuboids (including cubes), cones, ellipsoids (including spheres), regular polyhedra (including pyramids), prisms (including cylinders). But there are many more irregular shapes for which no formulae exist.


Which three-dimensional figures have circular bases?

Cones, cylinders.


How are pyramids and cones different than prisms and cylinders?

They depend on radius rather than perimeter.


Why aren't cylinders and cones and spheres polygons?

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


What 3 dimensional figure has a round base?

Cones, hemispheres, and cylinders have.


What is the similarity among spheres cones and cylinders?

A circular cross-section.


What are examples of prisms pyramids cylinders and cones in real life?

Prisms: Feed troughs, bathtubs, and boxes. Pyramids: Pyramids of Egypt and the Aztecs. Cylinders: Cans, pistons, tubes, and pipes. Cones: Ice cream cones, funnels, and the bottom part of a water tower.


Why aren't cylinders cones and spheres polyhedrons geometry?

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