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The special features of 3D shapes are they all are 3D which means they are fat but 2D shapes are flat they can not stand up.
3D shapes have three dimensions, namely length, breadth and height.
Polygons are 2d shapes whereas polyhedrons are 3d shapes
No because 2d shapes are plane such as polygons but example of 3d shapes are: pyramid, cone, cuboid, cylinder, sphere ... etc
2d shapes only have length and width, while 3d shapes have length, width and depth.