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# Project News Polyhedr.com in November 2019 Assembly of the first four polyhedra:

- truncated tetrahedron;

- truncated octahedron;

- truncated cube;

- cuboctahedron

# 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.

### Nets solids of revolution What happens if a flat geometric shape, such as a rectangle, begins to rotate rapidly relative to one of its sides?
We create a new geometric solid in space by rotation.

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

The form of the tetrahedron is transmitted by antimony sodium sulfate.

### The star of hope

A star is an image of divine idea and will; due to them, our Light and Universe were created and started to exist in Space.

### Practical use of paper models

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

### What is a polyhedron? 