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Conchoid (mathematics)

Conchoids of line with common center.
  Fixed point O
  Given curve
Each pair of coloured curves is length d from the intersection with the line that a ray through O makes.
  d > distance of O from the line
  d = distance of O from the line
  d < distance of O from the line
Conchoid of Nicomedes drawn by an apparatus illustrated in Eutocius' Commentaries on the works of Archimedes

In geometry, a conchoid is a curve derived from a fixed point O, another curve, and a length d. It was invented by the ancient Greek mathematician Nicomedes.[1]

  1. ^ Chisholm, Hugh, ed. (1911). "Conchoid" . Encyclopædia Britannica. Vol. 6 (11th ed.). Cambridge University Press. pp. 826–827.
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