Tetrahedron: It is the smallest "regular solid" (Edges=Faces+Corners-2), 4 faces, each one an equilateral triangle. 4 corners
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Four.
with its additional features that make it special
it can be a rectangular prism
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.
a cube can be in a rectangular prism