Trigonometry – What Exactly Is a Radian?

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.

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Trigonometry – Basic Introduction:

Introduction to Angles:

Radians and Degrees:

What Exactly Is a Radian?

Coterminal Angles:

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Decimal Degrees to DMS:

Arc Length of a Circle and Sector Area:

Linear Speed and Angular Velocity:

Clock to Angle Problems:

The Unit Circle:

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