Albrecht Drer was the third son of Albrecht Drer and Barbara Holfer.He was one of their eighteen children.Here are portraits of his father and mother.Here is a portrait of Wolgemut.Here are portraits of Agnes.Here is one of his paintings of Trento.In the second book he gave exact and approximate methods to construct regular polygons.Book three considers pyramids, cylinders and other solid bodies.The second part of this book studies sundials and other astronomical instruments.The final book studies the five Platonic solids as well as the semi-regular Archimedean solids.