In addition to his heavy workload Cauchy undertook mathematical researches and he proved in 1811 that the angles of a convex polyhedron are determined by its faces.
Bilang karagdagan sa kanyang mabigat na workload Cauchy undertook matematiko pananaliksik at siya proved sa 1811 na ang mga angles ng isang matambok polyhedron ay tinutukoy sa pamamagitan ng kanyang mukha.