Question

what are polyhedrons. Is cylinder a polyhedron or not give reasons​

Answer 1

Answer:

Thus a cylinder is not a polyhedron for several reasons: its lateral surface is notplane, its bases are not polygons, finally it has no vertex! No faces, no edges, novertices, it couldn't be worse! ... Nevertheless two faces can intersect but the intersection is not an edge.

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Answer 2

Answer:

In geometry, a polyhedron is a solid in three dimensions with flat polygonal faces, straight edges and sharp corners or vertices. The word polyhedron comes from the Classical Greek πολύεδρον, as poly- + -hedron.

A cylinder is not a polyhedron for several reasons: its lateral surface is not plane, its bases are not polygons, finally it has no vertex! No faces, no edges, no vertices, it couldn't be worse. Nevertheless two faces can intersect but the intersection is not an edge.