1d has only the length, but 2d has both the length and width.
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difference between 2d and 3d transformation matrix
It doesn't have any volume (3D) and it's not a line (1D). Thus, it is a 2D shape.
a 2D object is is flat and on the other hand a 3D object is bulgy
Triangles are 2d. Pyramids are 3d.
Give vidoes to understand the 2d and 3d shapes clearly