How do you make a tetrahedron?

Answer 1

you can use your favorite 3d creation program of your choice, i prefer Rhino, or Alebra. Make a pentagon, copy, and rotate the sides from the center of the first pentagon exactly 63.43 degrees or the complementary of that angle. Its really easy because then you just mirror that second pentagon onto the other sides of the first pentagon. If you want a more elaborate explanation, go look for another tutorial on some site, maybe YouTube if your lucky. Sorry but there you go.

Answer 2

http://www.videojug.com/webvideo/how-to-make-an-origami-tetrahedron