Tetrahedron
This is a pattern for making a paper tetrahedron. A tetrahedron is a solid shape with four faces. Each face is an equilateral triangle.
The instructions on the worksheet give the simplest method of constructing the tetrahedron. With more care, a better looking tetrahedron can be constructed.
A greater selection of polyhedron patterns can be made from Stella: The Polyhedron Navigator.