postulado 13 paralelogramos 24
It is impossible to construct a rectangle divided into congruent rectangles or rhomboid divided at rhomboid congruent with order ( m, r ) or ( r, m ) m greater than r, or r greater than or equal to one, so that the higher and the lower parallelogram base side are divided, r m times respectively with the length of the sides of shorter and longer length of the congruent parallelograms and times respectively.