Three focussharing conicsdefine a quadrilateral of intersections of lines connecting the intersections of common tangents. Here, the black conic is the absolute conic. Again, F_{1} is the focus common to K_{2} and K_{3}, and the intersection of one pair of tangents common to these two conics. The other pair of common tangents meet in T_{1}. The six points turn olut to be the vertices of a quadrilateral.

