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A combination of the above plane polygonal pieces such that the Edges are coincident. There are 13 convex tangrams (where a ``convex tangram'' is a set of tangram pieces arranged into a Convex Polygon).
See also Origami, Stomachion
References
Cundy, H. and Rollett, A. Mathematical Models, 3rd ed. Stradbroke, England: Tarquin Pub., pp. 19-20, 1989.
Gardner, M. ``Tangrams, Parts 1 and 2.'' Ch. 3-4 in Time Travel and Other Mathematical Bewilderments.
New York: W. H. Freeman, 1988.
Johnston, S. Fun with Tangrams Kit: 120 Puzzles with Two Complete Sets of Tangram Pieces. New York: Dover, 1977.
Pappas, T. ``Tangram Puzzle.'' The Joy of Mathematics. San Carlos, CA: Wide World Publ./Tetra, p. 212, 1989.