Witch of Agnesi
- Zoltán Kovács
Witch of Agnesi is the locus (trace) of point F while point D is moving on a circle. It is an algebraic (polynomial) curve with a degree of 3. The curve contains just one part, but in the figure there is an extra component (a line) because of some technical reasons. Thus the equation of the curve in the figure has a degree of 4.