Polyhedrons
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It is important to learn and remember the name of 3D shapes. A 19 faced 3d shape is called a nonadecahedron.
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.