The length of the diagonal of congruent diamonds or the congruent rhomboids that divides a polygon data ordered concave ( m, ) m greater than n, n greater or equal to two, 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 through them, mentally assumes that the ordered concave polygons were built.