Relationship of Sine and Cosine to the Unit Circle

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.



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Related Curriculum Standards

US Common Core State Standards, Mathematics