De Divina Proportione is a book by Luca Pacioli illustrated by Leonardo da Vinci

De Divina Proportione (About the divine proportions) is a book on mathematics written by Luca Pacioli around 1497 in Milan and first printed in 1509. Today only two versions of the original manuscript are believed still to exist. The subject was mathematical and artistic proportions, and the book was illustrated by Leonardo da Vinci.

Mathematical Association of America Archive