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 - 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 _________________________ 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 _______________________________________ Final Exams and Video Playlists: https://www.video-tutor.net/ Full-Length Videos and Worksheets: https://www.patreon.com/MathScienceTutor/collections