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An angle is formed when two rays meet.
These are the points where three faces meet.
A polyhedron (solid shape formed by plane faces) with four faces is called a tetrahedron.
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.