[fr] Nous montrons dans ce petit texte comment calculer les coordonnées de la projection orthogonale d'un point à partir des coordonnées de ce point. Nous commençons par quelques rappels théoriques, généraux puis de plus en plus précis, pour expliquer comment mener les caculs. Nous arrivons ainsi à des formules tout à fait pratiques, et nous montrons comment les mettre en œuvre lorsque LaTeX est utilisé avec le module de dessin Tikz — mais les aficionados de PSTricks n'auront pas de mal à adapter la technique.
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