They are those that contain all the polygons sorted concave data ( m, r, n ) m greater than r, r greater than n, n greater or equal to one, which are divided into diamonds consistent or congruent rhomboid and that limited him a rectangle and a diamond shape respectively. As two, the major and minor of the circumscribed parallelogram, side can be divided m and r times with the major and minor of congruent parallelograms length respectively.