This trigonometry video tutorial explains what exactly a radian is using angle measures, the radius, circumference, and arc length of a circle. This video also explains how to convert from radians to degrees and degrees to radians.

Trigonometry - Free Formula Sheet:
https://www.video-tutor.net/formula-sheets.html

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Trigonometry - Basic Introduction:
https://www.youtube.com/watch?v=g8VCHoSk5_o

Introduction to Angles:
https://www.youtube.com/watch?v=oxhXz9_uyiM

Radians and Degrees:
https://www.youtube.com/watch?v=JmLN3QxshlE

What Exactly Is a Radian?
https://www.youtube.com/watch?v=CHCWXAkozHM

Coterminal Angles:
https://www.youtube.com/watch?v=RkMhGwp8pv4

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Decimal Degrees to DMS:
https://www.youtube.com/watch?v=W9kousU6AI0

Arc Length of a Circle and Sector Area:
https://www.youtube.com/watch?v=C9z3FXS7nlo

Linear Speed and Angular Velocity:
https://www.youtube.com/watch?v=FgTvlGm9jgE

Clock to Angle Problems:
https://www.youtube.com/watch?v=LEHYr0XfSyI

The Unit Circle:
https://www.youtube.com/watch?v=57VrEiEPD1I

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