unit circle

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


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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
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