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EUKLID DynaGeo is a computer program about "dynamic geometry". It allows to construct dynamic drawings i.e. drawings in which (some) objects can be dragged with the mouse to a new position without losing the interdependencies of the geometrical objects established during the preceeding construction:
a perpendicular bisector will always stay a perpendicular bisector,
a line segment joining the points A and B will always run from A to B
a parallel line will always stay parallel,
etc....
