postulado 12 paralelogramos 19
If ( m, r ) or ( r, m ) m greater than r, r greater than or equal to one, is the order of a rectangle divided into congruent rectangles or a diamond shape divided at rhomboid congruent, are the three, if length greater side and the lower rectangle side base or rhomboid base are divided times and m r times respectively with the length of the longest and shortest of the congruent parallelograms sides respectively.