Chapter 1 – Unit Circle and Definitions

Topic 1.3
The Radian Measure of an Angle

The Radian Measure of an Angle establishes the connection between angles measured on the unit circle in degrees and the arc length around the circumference of the circle. Sine and cosine values are referenced, though they are not taught in this lesson, nor are they important here. Conversions from radians to degrees and from degrees to radians are performed.

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Trigonometry by Mike Weimerskirch and the University of Minnesota Board of Regents is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License, except where otherwise noted.