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.

**
**

If you don't like math, then on Halloween, evil forces will come for you! Create two guards who...

Boxes for Big Mac and potatoes familiar to everyone from childhood, a glass for Coca-Cola is also...

In the natural environment, regular polyhedra can be found in the form of crystals (minerals). The...

Quite often, a question about the practical use of paper models pops up. What is the point of...

So far, we have actively used glue to assemble polyhedrons from the Magic Edges sets. Moreover, we...

It is round, but nobody canceled the shape net of parts for its...