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A sphere is a round object. It has no sides. The object is 3-D. (Three Dimensional)
No sides or corners
A polyhedron has "many sides" (by definiton). The only 3-D shape which does not have "many sides" is a sphere (which technically only have one "side").
NONE!!! However, there are two sides to a sphere ; viz. INside and OUTside. Ha!!!Ha!!! Ha!!! My silly joke!!!!!