In 2 dimensional space, a vertex is formed when two lines meet at an angle. In 3D space, a vertex is a point where three or more faces meet.
A sphere is not an arced line but is one curved surface. It has no vertex.
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A sphere has no faces, no edges, and no vertices.
There are no corners to a sphere because a sphere should have no vertices.
None
Technically speaking, a sphere has 0 faces,sides,edges or vertices. It does have a point in the middle of it marking the radius though.
A sphere is not a polyhedron because it has no edges, no vertices and no flat faces The word 'polyhedron' means many faces.