<table><tr><td> [[FileImage:fill1_tn_new.png|thumb|left|500px|The process of extruding an edge.]] </td></tr><tr><td> [[FileImage:fill1_tnB_new.png|thumb|left|500px|The process of extruding an edge.]] </td></tr><tr><td> [[FileImage:fill2_tn_new.png|thumb|left|500px|The process of extruding an edge.]]</td></tr></table>
Three closed curves with two enclosed inside the other and the planar object resulting from filling the curves.