4 corners
4 angles
Angles add up to 90'
All angles are right angles
Has 4 lines of symmetry
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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.
Draw a square of any size on a piece of paper, and that is what a 2D square looks like.
A square.
It's a 2D shape.
no. the square is 2d and the cube is 3d