0.00 $
 0 item(s)

Tetrahedron. How to make pdf template


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).

Therefore, the question "What is a tetrahedron?", We can give the following definition: "Tetrahedron is a geometric solid of four faces, each of which is a regular triangle".

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.





A gift to a schoolboy to 9 USD

Find a gift for the schoolboy that will be interesting, useful, and not ruin the family budget - is...

Why can the paper be so strong?

Sometimes you hear the question: “Why did you choose paper (or more precisely, design cardboard) to...

Six boxes and the golden ratio

This polyhedron model is the intersection of three parallelepipeds.It is based on the intersection...

Archimedean Polyhedra. How to make pdf template

Archimedes, a scientist from Ancient Greece, discovered thirteen types of polyhedra, now called...

Nets solids of revolution. How to make pdf template

What happens if a flat geometric shape, such as a rectangle, begins to rotate rapidly relative to...

Practical use of paper models

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

Prickly stars on the towers

  Imagine a historic building, an architectural ensemble that is decorated with stellated polyhedra. And...