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983What is a Radian?
984Converting Degrees to Radians
985Converting Radians to Degrees
986Common Angle Conversions
987Arc Length Using Radians
988Sector Area Using Radians
989Angular Velocity and Radians
990Coterminal Angles in Radians
991Defining the Unit Circle
992Coordinates on the Unit Circle
993Special Angles in Degrees and Radians
994Reference Angles and the First Quadrant
995Second Quadrant Points
996Third Quadrant Points
997Fourth Quadrant Points
998Coterminal Angles on the Unit Circle
999Negative Angles and Clockwise Rotation
1000Using the Unit Circle to Find Exact Values

983What is a Radian?
984Converting Degrees to Radians
985Converting Radians to Degrees
986Common Angle Conversions
987Arc Length Using Radians
988Sector Area Using Radians
989Angular Velocity and Radians
990Coterminal Angles in Radians
991Defining the Unit Circle
992Coordinates on the Unit Circle
993Special Angles in Degrees and Radians
994Reference Angles and the First Quadrant
995Second Quadrant Points
996Third Quadrant Points
997Fourth Quadrant Points
998Coterminal Angles on the Unit Circle
999Negative Angles and Clockwise Rotation
1000Using the Unit Circle to Find Exact Values

← Mathematics

Lesson 991 of 3,121·24. Unit Circle and Analytic TrigonometryPro lesson

Defining the Unit Circle

Learn what the unit circle is, its equation x² + y² = 1, and why it's centered at the origin with radius 1.

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