unit circle

noun Mathematics.
a circle whose radius has a length of one unit.

Origin:
1950–55

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Extend the domain of trigonometric functions using the unit circle.
Trigonometric functions defined on the unit circle will be related to
  trigonometric functions defined in right triangles.
The semi-circular distribution is the distribution onto one axis of the points
  uniformly distributed within the unit circle.
Properties of the unit circle and definitions of circular functions will be
  applied.
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