This geometry and trigonometry video tutorial explains how to calculate the arc length of a circle using a formula given the angle in radians the and the length of the radius. It also explains how to calculate the sector area in terms of pi or in radians. In addition, it also explains how to determine the area of a sector of a circle using an equation where the angle is given in degrees instead of radians. This video contains plenty of examples and practice problems. 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