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The bases are circles and it has no vertices. So, it is a cylinder.
\A polyhedron is a solid made from flat surfaces that enclose a single region of space.
\This solid has curved surfaces, so it is not a polyhedron.
\The given figure is a solid with congruent parallel circular bases connected by a curved surface.
\Therefore , it is a cylinder.
\Bases:![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=12c934548ab9acf7a8d1434699ea7e80.png\")
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![\"\"](\"/userfiles/image/steps_images/solution.JPG\")
Not a polyhedron; it is a cylinder.