Nets of three-dimensional solids

## Possible nets for a tetrahedron

There are only 2 possible nets for a tetrahedron. These are shown below.

Note: There are 4 triangles which are all the same (4 congruent equilateral triangles). When the net is folded into a tetrahedron at each vertex there are three edges/faces meeting. These are the only two configurations of 4 such triangles that form a net for the tetrahedron.

Try some others to convince yourself that this is true.

© Australian Mathematical Sciences Institute, except where indicated otherwise. This material is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported (CC BY-NC 3.0) licence http://creativecommons.org/licenses/by-nc/3.0/