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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.

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โˆ™ 2014-02-16 21:02:50
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Q: Why are cylinders and cones not considered to be a polyh?
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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.


Cylinders and cones are just polyhedrons with circular bases?

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


How are pyramids and cones different than prisms and cylinders?

Pyramids and cones have one base and an apex whereas prisms and cylinders have two bases.


Which three-dimensional figures have circular bases?

Cones, cylinders.


Why aren't cylinders and cones and spheres polygons?

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


Are cones and cylinders polyhedra?

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


What is the similarity among spheres cones and cylinders?

A circular cross-section.


What 3 dimensional figure has a round base?

Cones, hemispheres, and cylinders have.


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.


How are cylinders and cones alike in math?

They have at least one circular base.


How are the surface area formulas of cones and cylinders similar?

They both depend on circumference not perimeter.

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