# Exploration of Polarity defined by a Conic.

- Author:
- Alison Middelkoop

**Exploration of Polarity defined by a conic.**Left Click on points D and/or E to move them shows that the line BC (the dual line) remains the same and so is independent of the choice of lines through A. The point A can also be moved Moving point F1 and F2 changes the size of the ellipse. Point A can also be moved.