It consequently has four **vertices** and six edges.

This solid has 4 faces, 4 **vertices** and 6 edges.

The funicular or link polygon has its **vertices** on the lines of action of the given forces, and its sides respectively parallel to the lines drawn from 0 in the force-diagram; in particular, the two sides meeting in any vertex are respectively parallel to the lines drawn from 0 to the ends of that side of the force-polygon which represents the corresponding force.

The truncated octahedron is formed by truncating the **vertices** of an octahedron so as to leave the original faces hexagons; consequently it is bounded by 8 hexagonal and 6 square faces.

If we take any polyhedron with plane faces, the **null**-planes of its **vertices** with respect to a given wrench will form another polyhedron, and the edges of the latter will be conjugate (in the above sense) to those of the former.