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Watt's linkage

This activity belongs to the GeoGebra book Linkages. The problem of visualizing a mathematical model of an object by means of Dynamic Geometry is not new. A typical example in the field of mechanisms is the well-known Watt's linkage, which includes branch choice and continuity problems, well known in the world of Dynamic Geometry, without the possibility of a "formal" visual solution.
Author of the construction of GeoGebra: Zoltán Kovács
Another thing is the visual "simulation" of a solution, using scripts:
Author of the construction of GeoGebra: Rafael Losada