First, let us identify these five geometric objects — or, in the terminology of mathematicians, geometric solids.

**First of all, why are these five geometric solids called regular polyhedra?**

This is quite easy to remember. The sides of **regular polyhedra** are regular polygons, and in turn, regular polygons are those in which all sides are equal (e.g., triangle, square) and have equal angles between adjacent sides. This is why they are called "**regular**".

**What is the connection with Plato?**

Most likely, the ancient Greek scientist Plato was not related to the discovery of these remarkable polyhedral, but Plato had another talent. In the modern world, Plato could be called the popularizer of regular polyhedra. The greatest contribution Plato made is that he told people about the existence of regular polyhedra.

If this is all he had done, however, the majority would have quickly forgotten about them. But Plato endowed these seemingly simple objects with incredible strength and mystical meaning and brought them to the forefront of his teaching.

In an attempt to explain the nature of everything that exists, Plato considered five regular polyhedra to be fundamental principles for the structure of each of the elements:

- **fire** correlated with the tetrahedron;

- **air** correlated with the octahedron;

- **earth** correlated with the hexahedron;

- **water** correlated with icosahedron;

- and the dodecahedron corresponded to the Universe.

It was the power of Plato's philosophy and mystical postulates that were entrenched in the minds of ordinary people, which inextricably linked by these polyhedra with the ideas of Plato. And, at some point, people began to talk about five regular polyhedra as Platonic solids.

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