Negative Pedal Curve
Given a curve 
and 
a fixed point called the Pedal Point, then for a point 
on , draw a LinePerpendicular to 
. The Envelope of these Lines as describes the curve is thenegative 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.
- Schinzel's Hypothesis
- Schinzel's Theorem
- Schisma
- Schlegel Graph
- Schläfli Double Six
- Schläfli Function
- Schläfli Integral
- Schläfli Polynomial
- Schläfli's Formula
- Schläfli's Modular Form
- Schläfli Symbol
- Schlömilch's Function
- Schlömilch's Series
- Schmitt-Conway Biprism
- Schnirelmann Constant
- Schnirelmann Density
- Schnirelmann's Theorem
- Schoenemann's Theorem
- Scholz Conjecture
- Schoolgirl Problem
- Schoute Coaxal System
- Schoute's Theorem
- Schrage's Algorithm
- Schroeder Stairs
- Schröder-Bernstein Theorem