# Trisecting an Angle Using a Conchoid

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This Demonstration shows how Nicomedes (c. 180 BC) used a conchoid to trisect an angle.

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Contributed by: Izidor Hafner (November 2012)

Open content licensed under CC BY-NC-SA

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Reference

[1] D. E. Smith, *History of Mathematics*, Vol. II, New York: Dover, 1958 pp. 299–300.

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