Unit CircleHigh School · Functions · HSF-TF.A.1, HSF-TF.A.2
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High School · Functions · Think & learn · Ages 14–18

Unit Circle

Maths standardHSF-TF.A.1HSF-TF.A.2Use radian measure and the unit circle to find sine and cosine of special angles in every quadrant.

  1. π radians = 180°.
  2. On the unit circle the point is (cos θ, sin θ).
  3. Use the reference angle, then fix the sign by quadrant.
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