GDI 

 

The goal: an intelligent dynamic geometry program    -able to simulate on the computer the ruler and compass paradigm    -able to drag elements on constructions while keeping established relations among geometric objects    -omniscent (as a teacher!!) regarding facts about the geometric constructions        -enhanced features (geometric locus, 3D, web access, etc.)                              First versions around 2000 

Authors:                        F. Botana http://webs.uvigo.es/fbotana/                                       J.L. ValcarceSeveral similar and recent attempts...Geometry Expert, Cinderella, Geother...but, of course, GDI is endowed with some unique features...• Given a triangle ABC, a point X, its symmetrical points with respect to the sides, say, M,N,P, ....... then points M, N, P   are they aligned? 

 

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