Classroom » Reference
tangram
Traditionally used to create shapes and figures from seven geometric pieces (or tans): five triangles in different sizes, one square, and one parallelogram. Tangrams can also be used for other math functions, including measures of area and fractional parts and wholes.
See also manipulative.
Additional information
Tangrams are thought to derive from centuries-old Chinese puzzle games. In Chinese, tangrams are called ch’i ch’iao t’u, or ingenious-puzzle figure of seven pieces.
Examples and resources
Tangrams are laid out as follows:

Tom Scavo has created a page on "Constructing Your Own Set of Tangrams," and Math Portal has a link to "Working with Tangrams."