This program is for geometric construction, not necessarily by ruler and compass, see exact values of constructed coordinates of points, distances, trigonometric values of constructed angles etc.
This version of a program "Ruler and Compass" includes new algebra module, quadratic functions and cubic functions module. One of new features is a calculator, which computes with accuracy (up to) 900 significant digits. There is a separate software Calculator of Literka installation program 'installcalc.exe' which you can download free.
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