Figure 2: Three Conics
Three conics Q(D), Q(E) and Q(F) are shown.
The conic Q(F) is the one that appears to come closest
to the points D and E.
In the dynamic figure, Q(F) is
the one conic of these three that does not move as a function of F.
The other two conics, Q(D) and Q(E) move as a function of F.
The three conics all meet at two points T1 and T2
on the line L1.
Here both T1 and T2 are labeled simply by T.
The Cabri Geometry II source code is
available for all figures used in this paper, as well as demonstration
versions of Cabri Geometry II for Windows and Macintosh operating systems.
© 1997, 1999, Leroy J. Dickey