Keywords: Cross graph 9.svg Cross-polytope graph en Image Cross graph 9 png 2006-10-24; 2007-11-30 en User Tomruen; traced by User Stannered Tomruen en Image Cross graph 9 png Cross-polytope graphs 9 Regular octadecagons 18-fold rotational symmetry Geometry images with dihedral symmetry 18 Created with Inkscape |