After coming to Milan in 1496, friar Luca Pacioli became friends with Leonardo and his master teacher in mathematics and geometry. Using an edition translated from Latin into vernacular Italian, Pacioli helped Leonardo understand Euclid. Pacioli also took part in drafting the treatise Divine proportione (Divine Proportion), for which Leonardo drew his wonderful polyhedrons, and in a new edition of Euclid’s works.
