## 30 March 2018

### Tangram

The tangram is an ancient Chinese solitaire game. It consists of seven pieces that you can assemble to form a square (original square):
• $5$ triangles;
• $1$ square;
• $1$ parallelogram.
Notice that the smaller triangle is the unit area of the original square, which is $16$ times the area of ​​the smaller triangle. The diagonal of the original square is $4$ times the altitude of the smaller triangle, its side $2$ times the base or $4$ times the median of the base of the smaller triangle.

The tangram can be used in two ways: either as a puzzle or as an assessment material of flexibility, fluidity and creative originality.

In its role as a puzzle, the aim of the game is to reproduce a given model. The rules are simple: we always use all the pieces that must be arranged on a flat surface without superimpose them. There are approximately $2,000$ different models, some extremely difficult, which makes the tangram an even more interesting game! These models can be geometric or figurative.