Tangram is a very popular puzzle that was created in China a long time ago (960–1279). The game crossed the sea and arrived in Europe in the early 19th century. It became very popular there because it is simple to understand and easy to play.
The puzzle consist of 7 polygons (tans): 5 triangles, 1 square and 1 parallelogram. These pieces must be placed to create a specific shape. Sometimes it is possible to find more than one solution for a puzzle.