The tangram is a very old Chinese game, which consists of forming silhouettes of figures with the seven given pieces without overlapping them. The 7 pieces, called "Tans", are the following:
- 5 triangles, two built with the main diagonal of the same size, the two small ones in the central strip are also the same size and one of medium size located in a corner.
- 1 square.
- 1 parallelogram or rhomboid.
Normally the "Tans" are kept in a square.