A polyhedron is defined as a three-dimensional figure composed entirely of flat polygonal faces, which meet at edges and vertices. In contrast, a three-dimensional figure with a curved surface, such as a sphere or cylinder, lacks flat faces and instead has continuous curves. Therefore, the presence of a curved surface disqualifies such figures from being classified as polyhedra.
It is so by definition.
cube
It is a sphere which looks like a globe
A polyhedron.
a polygon(or polyhedron) is a three dimensional figure that has straight edges. * * * * * A polygon is 2 dimensional, a polyhedron is 3-d.
Because that is how a polyhedron is defined.
Because that is how a polyhedron is defined.
Because that is how a polyhedron is defined.
A polyhedron.
It is so by definition.
cube
Sphere
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No. A polygon is a 2-dimensional figure. A polyhedron is 3-dimensional.
A cuboid and a pyramid for examples.
It is a sphere which looks like a globe
A polyhedron.