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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.

- The elliptic (spherical) geometry is realized with macros too. (Example)