Given a curve and a fixed point called the Pedal Point, then for a point on , draw a Line Perpendicular to . The Envelope of these Lines as describes the curve is the negative pedal of .

**References**

Lawrence, J. D. *A Catalog of Special Plane Curves.* New York: Dover, pp. 46-49, 1972.

Lockwood, E. H. ``Negative Pedals.'' Ch. 19 in *A Book of Curves.* Cambridge, England: Cambridge University Press,
pp. 156-159, 1967.

© 1996-9

1999-05-25