postulado 62, poligonos concavos ordenados 22
The length of the diagonal more of them diamonds congruent or of them rhomboid congruent in that is divided a polygon concave ordered of dato ( m, r, n ) m greater than r, r greater than n, n greater or equal to one, is equal to the length of the side than the congruent rectangles or the congruent rhomboids that divides a square and a rhombus of order ( m, r ) m greater than r, r greater than or equal to two respectively, and this is mentally supposed that the ordered concave polygons were built.