0.00 $
 0 item(s)

What is a polyhedron? How to make pdf template

18gl

A polyhedron is a solid bounded by flat polygons, which are called faces.

 

 

Examples of polyhedra:

Examples of polyhedra

The sides of the faces are called edges, and their corners are called vertices.

The number of faces distinguishes polyhedra. There may be tetrahedrons, pentahedrons, etc.

A polyhedron is considered to be convex if it is located on one side of the plane of each of its faces. A polyhedron is called regular if its faces are regular polygons (i.e., where all sides and angles are equal), and all polyhedral angles at the vertices are equal. There are five types of regular polyhedra: tetrahedron, cube (regular hexahedron), octahedron, dodecahedron, icosahedron.

In three-dimensional space, a polyhedron (the concept of a polyhedron) is a set of a finite number of flat polygons where
1) Every side of a polygon is a side of the other one (but only one), called adjacent to the first one (along this side);
2) From any of the polygons that make up a polyhedron, you can reach any of them by going to the adjacent one, and from this, in turn, to the adjacent one, etc.

These polygons are called faces, their sides are called edges, and their vertices are the polyhedron's vertices.

 

polyhedrons vertices polyhedron verticesvertices
polyhedrons edges  polyhedron edgesedges
polyhedrons faces  polyhedron facesfaces

A polyhedron is said to be convex if it is located on one side of the plane of each of its faces.

This definition implies that all faces of a convex polyhedron are flat polygons. The surface of a convex polyhedron consists of faces that lie on different planes. Simultaneously, the sides of polygons are the edges of the polyhedron. The polyhedron's vertices are the vertices of its faces, and the plane angles of the polyhedron are the angles of its polygons-faces.

A convex polyhedron is called a prismatoid if its vertices lie in two parallel planes. Prisms, pyramids, and truncated pyramids are particular cases of a prismatoid. All lateral faces of a prismatoid are triangles or quadrangles, while quadrangular faces are trapezoids or parallelograms.

Popular

Polyhedra on the stamps

Stamps cover all significant events happening in the world. Much attention was paid to polyhedra by...

Multifaceted hearth

For a primeval man, fire once became a new form of social life. The night ceased to be an...

Polyhedra at a science festival

The festival of fascinating science was held in Moscow on April 24 and 25, 2015, at the physics...

Gift of FIFA - polyhedron box

The box geometric shape from a distance resembles a rounded shape, emphasizing the similarity with the...

Practical apply

When we demonstrate polyhedra assembled from the Magic Edges set, people often ask the same question...

Polyhedra in architecture. Part 1

Architectural masterpieces located in different parts of the world reflect the human soul. Secret...

What Magic Edges issue to start from?

Suppose you first saw the edition “Magic Edges” on the counter of a bookstore or Internet...