Boundless Algebra

Trigonometric Functions and the Unit Circle

Concept Version 4

Created by Boundless

Radians

One radian

One radian

The angle $t$ sweeps out a measure of one radian. Note that the length of the intercepted arc is the same as the length of the radius of the circle.

Source

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"Algebra and Trigonometry, Algebra and Trigonometry.."

http://cnx.org/contents/13ac107a-f15f-49d2-97e8-60ab2e3b519c@5.241 OpenStax CC BY 4.0.