How can define A and D Or A 4B 2D?
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the 2d means 2 letter d and the 3d means 3 letter d . example: 2d= d d 3d= d d d
d miens dimension 2d miens 2dimensions
A square based pyramid is a 3-d object. It does not have a 2-d name!
A quadrilateral is a 2D shape that has 4 sides
2d shape is a shape that is flat on the surface, but 3d shape is a shape that comes out of the surface. Like it is just in front of you.2d is just flat on the surface which is the difference. Hope you understand. Rebecca Ng 5