This is the set of points Q in R^{2} such that

For examples see conchoid of Nicomedes, conchoid of de Sluze.

Con"choid (?), n. [Gr. ; shell + form: cf. F. conchoide.] Geom.

A curve, of the fourth degree, first made use of by the Greek geometer, Nicomedes, who invented it for the purpose of trisecting an angle and duplicating the cube.

© Webster 1913.

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