La Trigonometria en els inicis de la matemàtica xinesa : algunes idees per treballar a l'aula

The Nine Chapters is the most important old Chinese mathematical text. It contains a chapter devoted to solving problems of triangles (chapter 9). The analysis of the method for solving problems—using the «base and height procedure» or «Gougu » procedure— together with the comprehension of later contributions of commentators led us to use old Chinese conceptions for training the XXI century students