A regular tetrahedron is a regular polyhedron formed by $$4$$ equal equilateral triangles. It is a regular triangular pyramid.
If we develop the tetrahedron, we obtain the following figure:
The main properties of the tetrahedron are:
- Number of faces: $$4$$
- Number of vertexes: $$4$$
- Number of edges: $$6$$
- Number of edges meeting in each vertexes: $$3$$