With original examples, we will discover how the new tools of the version 2 of Cabri 3D, arc, trace, measurement tools, calculator how to illustrate in a brand new way the notion of function: How to construct an helix, a cycloid as the trace of a point of a wheel. How to introduce trigonometric functions (sine, cosine) How to illustrate new investigations about the angles of the polygons obtained in cutting any polyhedron. How to conjecture the formula giving the area or the volume of any polyhedron.