Il pentagono come strumento per il disegno delle fortezze

Starting from the fifteenth century, the diagram of many fortresses has a pentagonal shape. Among the best known fortresses, in Italy we find the Fortezza da Basso of Florence, the Cittadella of Parma, the Cittadella  of Turin,  Castel Sant’Angelo in Rome.

The aim of this article is to analyze the reasons that link form and geometry to the planning of the design and the layout of pentagonal fortresses.