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Exact internet accessible computation of paths of points in planar linkages and diagrams

Dynamic Geometry, also known as Interactive Geometry, refers to computer programs where accurate construction of (generally) planar drawings can be made. The key characteristic of this software is that, when dragging certain elements of the configuration, the geometric properties of the construction are preserved. In this paper, we describe an educational web‐based application that complements standard dynamic geometry programs in a mathematically sound manner. We put the focus on computing the geometric locus of distinguished points in linkages and other geometric constrained configurations, since knowing the equations of such loci is a typical engineering task. The tool is located at http://nash.sip.ucm.es/LAD/LADucation.html. © 2009 Wiley Periodicals, Inc. Comput Appl Eng Educ 19: 835–841, 2011