0.00 $

0 item(s)

The ancient Greeks gave the polyhedron a name according to the number of faces. "Tetra" means four, "hedra" means the face (tetrahedron - a solid having four faces).

Therefore, the question "What is a tetrahedron?", We can give the following definition: "Tetrahedron is a geometric solid of four faces, each of which is a regular triangle."

Polyhedron refers to the regular polyhedra and is one of the five Platonic solids.

The tetrahedron has the following characteristics:

The type of the face is the right triangle;

The number of sides at the face is 3;

The total number of faces is 4;

The number of edges adjacent to the vertex is 3;

The total number of vertices is 4;

The total number of edges is 6;

The regular tetrahedron is composed of four equilateral triangles. Each vertex of it is a vertex of three triangles. Therefore, the sum of flat angles at each vertex is 180 °.

The tetrahedron has no center of symmetry, but has 3 axes of symmetry and 6 planes of symmetry.

Is the tetrahedron a pyramid? Yes, the tetrahedron is a triangular pyramid whose all sides are equal.

Can a pyramid be a tetrahedron? Only if it is a pyramid with a triangular base and each of its sides is an equilateral triangle.

**
**

** **

Young British designer, Richard Sweeney, creates amazing paper sculptures. It is interesting that...

A new and unusual way of making a model of Stellated polyhedron was discovered by a German...

Summer is the time that you want to spend outdoors. Children will sit at the desk in September,...

What is the relationship between an octahedron and a cube?

< Archimedes, a scientist from the Ancient Greece, discovered 13 types of polyhedra, called...

What does the dodecahedron and icosahedron have in common?

The Kepler's Star (nor Keplerstjernen), 45 meters high, is located near Oslo in the vicinity of...