The unit circle is used to help you find the exact values of trig functions of special angles (0°, 30°, 45°, 60°, 90° or their radian counterparts) and the multiples of those special angles.

Sal draws the graph of the tangent function based on the unit circle definition of the function.

Discover how to measure angles, distances, and heights using trigonometric ratios and the unit circle. Learn how to use sine, cosine, and tangent to solve real-world problems involving …

Learn how to use the unit circle to define sine, cosine, and tangent for all real numbers. Created by Sal Khan.

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Sal draws the graph of the tangent function based on the unit circle definition of the function.

What is the unit circle definition of the trigonometric functions? The unit circle definition allows us to extend the domain of sine and cosine to all real numbers.

For each point on the unit circle, select the angle that corresponds to it. Click each dot on the image to select an answer.

The unit circle is used to help you find the exact values of trig functions of special angles (0°, 30°, 45°, 60°, 90° or their radian counterparts) and the multiples of those special angles.

SAT Math Course: SAT Math > Unit 13 Unit circle trigonometry | Lesson Angles, arc lengths, and trig functions — Basic example Angles, arc lengths, and trig functions — Harder example