C.a.R. > Demos > Non-Euclidean Geometry
The hyperbolic geometry is realized using macros in C.a.R. With these macros, you can almost construct as usual. Here, we demonstrate that the sum of angles is less than 180° in the hyperbolic geometry.
Note that the corners of the triangle cannot be moved outside the basic circle. This is done with a special trick, using self reference of objects.