No 3D shape with FLAT SIDES has exactly 3 faces. 4 is the minimum.
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The faces in a 3-D shape (polyhedron, for example) are bordered by edges.
It doesn't exist. The least number of sides for a 3-D shape only made of triangles is 4.
A triangular pyramid * * * * * A triangular pyramid has no parallel faces. None. The correct answer is a parallelepiped (special cases: cuboid, cube).
A cylinder, a semi-torus (half a doughnut).
There is no 3D shape with 6 faces: 4 rectangles and 2 triangles. See the link for all forms of hexahedra.