Final answer:
A cylinder is not a polyhedron because it has a curved surface, while polyhedrons have flat faces made of polygons.
Explanation:
A cylinder is not a polyhedron as it does not have flat surfaces; it has a curved surface. Polyhedrons are solid figures with flat faces that are made of polygons.
For example, a cube is a polyhedron because it has flat faces made of squares. On the other hand, a cylinder has two flat ends (bases) and a curved surface, which does not fit the definition of a polyhedron.
Understanding the distinction between cylinders and polyhedrons is essential in geometry and solid geometry studies.
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