A tetrahedron is a three dimensional shape with four triangular sides. It is a type of pyramid.
In this case, I've created a regular tetrahedron -- it is made up of identical equilateral triangles.
Explore the tetrahedron by cutting out the geometry net, folding it and gluing the tabs.
Tetrahedron - Plain: you can trace this onto decorative paper or decorate it as you see fit
|Tetrahedron - Christmas:|
|Tetrahedron - Valentine's Day:||(color) or (B&W)|
Tetrahedron formulas: These are too complicated for most children. The shape is interesting because it is a platonic solid (a three dimensional shape made up of identical two dimensional shapes with the same number meeting at every vertex) I would skip the formulas for it but here they are in case you feel differently.
Surface Area of a regular Tetrahedron = where a is the length of an edge
Volume of a Tetrahedron = where a is the length of an edge