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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 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