Utilizing dynamic models to explain different aspects of geometry can be a powerful pedagogical tool. This is exactly what inspired Eduardo Veloso and Rita Bastos to write this classroom exercise for the Mathematical Association of America's "Convergence" site. In this exercise, mathematics educators will receive an introduction to several key aspects of the history of geometry through four examples. These examples include Albrecht Durer's double projection and Piero della Francesca's perspective image. After reading the background essays on these projections, users can download the dynamic versions of these constructions for their own use and edification. It is worth noting that several of the constructions are available in French. Geometer's Sketchpad is required to view the files.
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