As we shall see,the distance O(1)O(2) is *2* . The points O(1) and O(2) are the incentres of the congruent right triangles ABD and BCD,which are in fact Pythagorean triangles with a common hypotenuse BD of length 10.Note that the quadrilateral BO(1)DO(2) is,in fact,a parallelogram with the diagonals O(1)O(2) and BD intersecting at their common midpoint.Now,picture the genefal case in which the rectangle ABCD is formed by glueing together two congruent