C.a.R. (Compass and Ruler) is a dynamic geometry program that simulates the computer in constructing figures using a ruler and a compass. The free application and the source code are available under the License GPL.

In addition to its main function, C.a.R. (Compass and Ruler) offers many interesting possibilities to facilitate learning processes quickly and visualize all sorts of shapes and geometric objects: points, lines, segments, circles, arcs, angles, polygons, and conic sections.

You can modify the constructions carried out by only changing the position of basis points and dragging with the mouse. The new image is generated instantly. Thus, the user can analyze the effects of the changes and verify if the construction is correct.

C.a.R. (Compass and Ruler) can be used in mathematical expressions, including comprehensive functions and differential zeros. The formulas are displayed with Greek letters, and expressions replace the texts with corresponding values.

The animated images and the possibility of revising the basic points of the figures converted a career (Compass and Ruler) into an extremely useful tool for understanding geometric relationships.

Thanks to its predefined templates (macros), Compass and Ruler make it easy to run even more complicated constructions and organize thinking geometric. With more advanced macros is even possible to generate bodies in three dimensions. Hide the details and use different colors to see the figures more clearly.

C.a.R. (Compass and Ruler) shows the construction process step by step or in a movie. Its simple interface and context help make it fun and a useful tool to understand the geometric elements more complex better.