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

In geometry, a tetrahedron (plural: tetrahedra or tetrahedrons), also known as a triangular ... Regular tetrahedra alone do not tessellate (fill space), but if alternated with ..... tetrahedron has two special orthogonal projections, one centered on a vertex or ..... The tetrahedron has many properties analogous to those of a triangle, ...

https://www.quora.com/How-many-sides-faces-and-vertices-does-a-tetrahedron-have

Sides and faces are the same regarding polyhedra. You probably mean 'sides, edges and vertices'. Here it is, you can count them.

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

Has 5 Edges. For a polygon an edge is a line segment on the boundary joining one vertex (corner point) to another. ... of a solid object. This tetrahedron has 4 faces (there is one face you can't see) ... For many solid shapes the. Number of ...

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

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 the tetrahedron ...

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

The tetrahedron has four faces, all of which are triangles. It also has four ... It also has eight vertices and twelve edges. ... It has many interesting properties.

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

with four polyhedron vertices, six polyhedron edges, and four equivalent equilateral ... The tetrahedron has two distinct nets (Buekenhout and Parker 1998 ). ... is given by the tetrahedral graph, equivalent to the circulant graph Ci_(1,2,3)( 4) ...

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

Mar 13, 2019 ... It has 4 vertices and 6 edges. ... It also occurs as cells in many of the uniform polytopes. The full ... The resulting tetrahedron has edge length 2.

https://www.kjmaclean.com/Geometry/Tetrahedron.html

The tetrahedron has 6 sides, 4 faces and 4 vertices. In Figure 1 the ... How does the side of the tetrahedron relate to the radius of the sphere? The side of the ...

http://whistleralley.com/polyhedra/tetrahedron.htm

Nov 2, 2011 ... The tetrahedron has 4 faces, 4 vertices, and 6 edges. ... Tetrahedra do not pack space, but it is possible to pack space by combining tetrahedra ...

http://www.geom.uiuc.edu/~sudzi/polyhedra/archimedean/tetra_trunc.html

The Tetrahedron and the Truncated Tetrahedron. Tetrahedron 4 triangular faces 4 vertices. Truncated Tetrahedron 4 hexagonal faces, 4 triangular faces ...