The tangram is a combination of plane polygonal pieces such that the edges of the polygons are coincident. There are 13 convex tangrams (where a "convex tangram"
is a set of tangram pieces arranged into a convex polygon ).
Curiously, a tangram with colored squares (right figure) is part of the logo for the Dynegy company.
See also Origami ,
Stomachion ,
Tangram Paradox
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References Cundy, H. and Rollett, A. Mathematical Models, 3rd ed. Gardner,
M. "Tangrams, Part 1" and "Tangrams, Part 2." Chs. 3-4 in
Time
Travel and Other Mathematical Bewilderments. Illinois Power. "Illinois Power Home Page."
http://www.illinoispower.com/ . Johnston,
S. The
Fun with Tangrams Kit: 120 Puzzles with Two Complete Sets of Tangram Pieces. Johnston, S. Tangrams
ABC Kit. Pappas, T. "Tangram Puzzle."
The
Joy of Mathematics. Read, R. C. Tangrams:
330 Puzzles. Slocum, J. The
Tangram Book: The Story of the Chinese Puzzle with Over 2000 Puzzles to Solve. Referenced on Wolfram|Alpha Tangram
Cite this as:
Weisstein, Eric W. "Tangram." From MathWorld https://mathworld.wolfram.com/Tangram.html
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