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Generatrix vs Directrix - What's the difference?

generatrix | directrix |

In geometry terms the difference between generatrix and directrix

is that generatrix is a curve that, when rotated about an axis, produces a solid figure while directrix is a line used to define a curve or surface; especially a line, the distance from which a point on a conic has a constant ratio to that from the focus.

generatrix

English

Noun

(en-noun)
  • (geometry) A curve that, when rotated about an axis, produces a solid figure

    • Synonyms

    * describent

    directrix

    English

    (wikipedia directrix)

    Noun

    (directrices)
  • A female who directs; a directress.
  • (geometry) A line used to define a curve or surface; especially a line, the distance from which a point on a conic has a constant ratio to that from the focus.

    • Derived terms

    * conic section directrix * graph directrix * ruled surface directrix