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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"Relationship of Sine and Cosine to the Unit Circle"
http://demonstrations.wolfram.com/RelationshipOfSineAndCosineToTheUnitCircle/
Wolfram Demonstrations Project
Published: March 7 2011