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).

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

The tetrahedron has the following **characteristics**:

The type of 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 is a vertex of three triangles. Therefore, the sum of flat angles at each vertex is 180 °.

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

Is the tetrahedron a pyramid? Yes, the tetrahedron is a triangular pyramid where 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.

**
**

Is it possible to make up an icosahedron using more simple polyhedra?...

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

In the micro-world, polyhedra are found in molecules, viruses, and bacteria - the simplest...

The Great Archimedes is ready to help us. And it's great! According to legends, Archimedes created...

One can specify the following mathematical characteristics in each of the five Platonic solids: 1....

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