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A polygon is a plane (2-dimensional) object bounded by straight lines. A polyhedron (not polyhendron!) is a solid (3-dimensional) object bounded by polygonal faces.

So, pyramids and some prisms are polyhedra. A cylinder is a type of prism but, because two of its faces are circular, those faces are not polygons. As a result a cylinder is not a polyhedron.

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Q: Are pyramids polygons cylinders or prisms polyhendrons?

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Prisms have polygons as bases whereas cylinders have circles as bases. In a way, a cylinder is like a circular prism.

They are convex polyhedra. composed of at most two types of polygons..

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.

All shapes are polygons * * * * * Wrong! Neither is a polygons. Polygons are two-dimensional shapes enclosed by straight lines. Even a common shape, such as a circle is NOT a polygon. Pyramids and prisms are two of an infinite variety of polyhedra.

they are not sometimes prisms

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

Prisms have polygons as bases whereas cylinders have circles as bases. In a way, a cylinder is like a circular prism.

There is prisms and pyramids. There are also spheres and cylinders

They are convex polyhedra. composed of at most two types of polygons..

They are both named according to the polygons that form their base(s).

The bases of cylinders are circular whereas the bases of prisms are polygons.

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.

cones are similar to pyramids because they come to a point, also known as the vertex. Cones and pyramids are also conic. Cylinders are similar to prisms because their base, no matter what shape, will translate (slide) all the way up the middle to the top. Basically, their 2 bases should always always always be congruent. Prisms and cylinders are also cylindric.

They depend on radius rather than perimeter.

All shapes are polygons * * * * * Wrong! Neither is a polygons. Polygons are two-dimensional shapes enclosed by straight lines. Even a common shape, such as a circle is NOT a polygon. Pyramids and prisms are two of an infinite variety of polyhedra.

they are not sometimes prisms

... whereas one of the "bases" of prisms are vertices.

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