A 3D star is not a standard shape. You can easily add another point.
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A 3D star does not have corners, as it is a geometric shape made up of interconnected edges and vertices.
A 3d rectangle, or a cuboid, has eight corners.
No corners and two edges !
If it is a polyhedron, then four or more faces and four or more corners.
It has 6 faces, 12 edges and 8 corners or vertices
It has 5 corners if it is a 3D shape like a piramid but if it is 2D it is 3