In 1775, Lagrange introduced these compact forms to describe the area of the triangle or the volume of the tetrahedron Posted on 2020/11/13 by Carl Robitaille In 1775, Lagrange introduced these compact forms to describe the area of the triangle or the volume of the tetrahedron. pic.twitter.com/tMwseDN4AS— Fermat's Library (@fermatslibrary) November 12, 2020