Like most French cathedrals, the one of Leon is built with a geometric module based on the triangle (ad triangulum), the primary lines of which relate to the square root of 3, and to which respond all of the parts and the whole.
Ao igual que a maioría de catedrais francesas, a de León está construída cun módulo xeométrico baseado no triángulo (ad triangulum), cuxos membros relaciónanse coa raíz cadrada de 3, ao que responden a totalidade das súas partes e do todo.