Draw a square of any size on a piece of paper, and that is what a 2D square looks like.
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You cannot have a 2d pyramid - whether or not it is square based. The 2d cross section will depend on the plane of the cross section.
A square.
It's a 2D shape.
It will look like a 2D equilateral triangle if it is a triangular based pyramid which is called a tetrahedron.
no. the square is 2d and the cube is 3d