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The rotation of the polyhedron "The ninth stellated form icosahedron" from the details of the set "Magic Edges 28"

The release of the set to the end of November 2018.

On September 1, in the Victory Park on Poklonnaya Hill, we will take part in the 16th Moscow Press Festival.

Read more ...On September 30, 2018, the best educational projects of Moscow will gather at one site, and through workshops, lectures and interactive tasks, they will help you to understand and love mathematics.

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Sodium sulphate reminds the shape of tetrahedron.

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

1. The radius of the sphere circumscribing the polyhedron;

2. The radius of the sphere inscribed in the polyhedron;

3. The surface area of the polyhedron;

4. The volume of the polyhedron.

**polyhedron** is a solid bounded by flat polygons, which are called **faces. **The sides of the faces are called **edges**, and their corners are called **vertices**. Depending on the number of faces one can specify a tetrahedron (4 faces), pentahedron (5 faces), 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.

Architects have used the elements of polyhedra in designing their constructions since ancient times. Nowadays this approach distinguishes buildings among thousands of others.

The Ministry of Defense in USA has the shape of a regular pentagon.

Art. Lebedev Studio has offered a new birdhouse in the form of polyhedron.

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