High School Functions
Domain Trigonometric Functions
Cluster Extend the domain of trigonometric functions using the unit circle.
Standard Understand radian measure of an angle as the length of the arc on the unit circle subtended by the angle.

F-TF.A.1. Understand radian measure of an angle as the length of the arc on the unit circle subtended by the angle.

  • Bicycle Wheel
  • What exactly is a radian?

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