The contrapedal curve, also called a normal pedal curve, is defined analogously to a usual pedal curve with "tangent" replaced by "normal." In particular, the contrapedal curve of a curve is the locus of bases of perpendiculars let down to normal lines of .
See alsoEvolute, Pedal Curve
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ReferencesGray, A. Modern Differential Geometry of Curves and Surfaces with Mathematica, 2nd ed. Boca Raton, FL: CRC Press, 1997.Lawrence, J. D. A Catalog of Special Plane Curves. New York: Dover, p. 47, 1972.Zwikker, C. The Advanced Geometry of Plane Curves and Their Applications. New York: Dover, p. 151, 1963.
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Cite this as:
Weisstein, Eric W. "Contrapedal Curve." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/ContrapedalCurve.html