What are the characteristics of a tetrahedron?

A tetrahedron is a three-dimensional geometric shape composed of four triangular faces, with each face meeting at a vertex. It has four vertices and six edges, with all sides being equal in a regular tetrahedron. The tetrahedron is one of the simplest forms of polyhedra and has a symmetrical structure. Its internal angles and surface area can vary depending on the specific dimensions of the triangles that form it.