postulado 40 paralelogramos 23
The perimeter of a parallelogram, divided into congruent parallelograms of shape one on order ( m, r ) or ( r, m ) m greater than r, r greater than or equal to one, is equal to 2 that multiplies the sum of m by the length of the side of a greater length of the congruent parallelograms more r by the length of the side of shorter length of the congruent parallelograms.