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This is a total matter of opinon. 3D gives better graphics, but 2D is easier to draw or make.
Two equilateral triangles.
It will look like a 2D equilateral triangle if it is a triangular based pyramid which is called a tetrahedron.
No.
There is no 2D shape that makes a sphere, since a sphere is 3D by definition. The closest thing to a 2D sphere is a circle.