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Two.
A hexahedron is a solid with six plane faces, and a cuboid is a six-sided figure each face of which is a rectangle.
A polyhedron (solid shape formed by plane faces) with four faces is called a tetrahedron.
By its very nature of being a triangle, and a 2D shape, a triangle cannot have four plane faces. However, a tetrahedron is a polyhedron made up of four triangular faces.
An octahedron has 8 sides.An octahedron is a polyhedron with eight plane faces.