You can make a lovely Tetrahedron from an old envelope. Cut a square from the envelope with one end open. Then mark and crease an isosceles triangle. As you open the mouth of the square, its edges will join and make a beautiful Tetrahedron. Tape the open end to finish the model.
http://www.arvindguptatoys.com/toys/tetrahedron.html This work was supported by IUCAA and Tata Trust. This film was made by Ashok Rupner TATA Trust: Education is one of the key focus areas for Tata Trusts, aiming towards enabling access of quality education to the underprivileged population in India. To facilitate quality in teaching and learning of Science education through workshops, capacity building and resource creation, Tata Trusts have been supporting Muktangan Vigyan Shodhika (MVS), IUCAA’s Children’s Science Centre, since inception. To know more about other initiatives of Tata Trusts, please visit www.tatatrusts.org

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