Relationship of Sine and Cosine to the Unit Circle

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Rotate the blue arrow around the unit circle. The distance travelled from the point (1,0) to a point (, ) on a unit circle corresponds to the angle in radians between the positive axis and the line segment from the origin to the point (, ). The coordinate corresponds to the cosine of the angle and the coordinate corresponds to the sine of the angle. You can also see the angle in degrees.

Contributed by: Noel Patson (March 2011)
Additional contributions by: Andrew Cuthbert
Open content licensed under CC BY-NC-SA


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