# Polyhedron sentence example

More briefly, the figure may be defined as a

**polyhedron**with two parallel faces containing all the vertices.The points thus obtained are evidently the vertices of a

**polyhedron**with plane faces.Probably the best way to make a sphere is to make a

**polyhedron**with a large number of sides.Each stage of refinement defines a new, denser,

**polyhedron**whose vertices are related to local sets of vertices of the original.In the first place, each of these figures may be conceived as an orthogonal projection of a closed plane-faced

**polyhedron**.AdvertisementClerk Maxwell, who showed amongst other things that a reciprocal can always be drawn to any figure which is the orthogonal projection of a plane-faced

**polyhedron**.Normally by the end of the calculation less than one half of the entries in BOX actually are used to define the limiting

**polyhedron**.In origami this term is often misused to mean any star-like form produced by adding pyramids to the faces of a convex

**polyhedron**.The head of this list is iteratively decimated and the list updated until a target number of vertices for the sparse

**polyhedron**is met.This is one of the Platonic solids, and is treated in the article

**Polyhedron**, as is also the derived Archimedean solid named the "truncated tetrahedron"; in addition, the regular tetrahedron has important crystallographic relations, being the hemihedral form of the regular octahedron and consequently a form of the cubic system.AdvertisementThe "regular icosahedron" is one of the Platonic solids; the "great icosahedron" is a Kepler-Poinsot solid; and the "truncated icosahedron" is an Archimedean solid (see

**Polyhedron**).The "ordinary dodecahedron" is one of the Platonic solids (see

**Polyhedron**).The "small stellated dodecahedron," the "great dodecahedron" and the "great stellated dodecahedron" are Kepler-Poinsot solids; and the "truncated" and "snub dodecahedra" are Archimedean solids (see

**Polyhedron**).One needs to select all atoms in the cage - these will be the vertices of the final

**polyhedron**.The mensuration of the cube, and its relations to other geometrical solids are treated in the article

**Polyhedron**; in the same article are treated the Archimedean solids, the truncated and snubcube; reference should be made to the article Crystallography for its significance as a crystal form.AdvertisementIf the figure be entirely to one side of any face the

**polyhedron**is said to be " convex, " and it is obvious that the faces enwrap the centre once; if, on the other hand, the figure is to both sides of every face it is said to be concave, " and the centre is multiply enwrapped by the faces.A

**polyhedron**is said to be the hemihedral form of another**polyhedron**when its faces correspond to the alternate faces of the latter or holohedral form; consequently a hemihedral form has half the number of faces of the holohedral form.The correspondence of the faces of polyhedra is also of importance, as may be seen from the manner in which one

**polyhedron**may be derived from another.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.Octahedra having triangular faces other than equilateral occur as crystal forms. See

**Polyhedron**and Crystallography.Advertisement