I think the strongest 3D shape is a cylinder.
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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.
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Polygons are 2d shapes whereas polyhedrons are 3d shapes
3D shapes have three dimensions, namely length, breadth and height.
No because 2d shapes are plane such as polygons but example of 3d shapes are: pyramid, cone, cuboid, cylinder, sphere ... etc