unit circle

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English[edit]

Noun[edit]

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unit circle (plural unit circles)

  1. (geometry) A circle of radius 1.
  2. (trigonometry, the unit circle) The circle of radius 1 with centre at the origin, used in defining trigonometric functions.

Usage notes[edit]

  • Unit circle is seldom used in the simple geometric sense, where "a circle of radius 1" is much more common.

Translations[edit]