Tangram is Chinese geometrical puzzle consisting of a square cut into seven pieces which can be arranged to make various other shapes. 

Rules of Tangram
The rules are simple but the game can be more challenging than it first appears.
1. You must use all seven tans
2. The tans must lie flat
3. The tans must touch
4. None of the tans can overlap
5. The parallelogram is reversible

Solutions of Tangram

Solution: 1
Solution: 2
Solution: 3
Solution: 4