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https://en.wikipedia.org/wiki/Tetrahedron

For a regular tetrahedron of edge length a: ... With respect to the base plane the slope of a face (2√2) is twice that of an edge ... distances di from an arbitrary point in 3-space to its four vertices, we have.

https://www.mathsisfun.com/geometry/vertices-faces-edges.html

For a polygon an edge is a line segment on the boundary joining one vertex ( corner point) to another. Edges This Tetrahedron Has 6 Edges. For a polyhedron an ...

https://www.mathsisfun.com/geometry/tetrahedron.html

Notice these interesting things: It has 4 Faces; Each face is an Equilateral Triangle; It has 6 Edges; It has 4 Vertices (corner points); and at ...

https://mathworld.wolfram.com/RegularTetrahedron.html

with four polyhedron vertices, six polyhedron edges, and four equivalent ... subtended from a vertex by the opposite face of a regular tetrahedron is given by  ...

http://www.technologyuk.net/mathematics/geometry/tetrahedron.shtml

Jun 30, 2012 ... It has four (4) faces (the word tetra has its origins in the Greek language, and means four), six (6) edges, and four (4) vertices. What distinguishes ...

http://eusebeia.dyndns.org/4d/tetrahedron

Jun 3, 2019 ... It has 4 vertices and 6 edges. It is self-dual: the polyhedron formed by taking the convex hull of the center points of each face is also a tetrahedron.

https://artofproblemsolving.com/wiki/index.php/Tetrahedron

The tetrahedron (plural tetrahedra) or triangular pyramid is the simplest polyhedron. Tetrahedra have four vertices, four triangular faces and six edges.

https://artofproblemsolving.com/wiki/index.php/Platonic_solid

The tetrahedron has four faces, all of which are triangles. It also has four vertices and six edges. Three faces meet at each vertex. The cube has six faces, all of ...