An isoptic curve formed from the locus of tangents meeting at right angles. The orthoptic of a parabola
is its conic section directrix. The orthoptic
of a central conic was investigated by Monge and
is a circle concentric with the conic
section. The orthoptic of an astroid is a circle.
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ReferencesLawrence, J. D. A Catalog of Special Plane Curves. New York: Dover, pp. 58 and 207, 1972.
on Wolfram|AlphaOrthoptic Curve
Cite this as:
Weisstein, Eric W. "Orthoptic Curve."
From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/OrthopticCurve.html