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.

What are unit circle trigonometry problems? The problems in this lesson involve circles and angle measures in radians, a unit for angle measure much like degrees.

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 …

Sal shows how, for acute angles, the two different definitions of the trigonometric values (SOH CAH TOA and the unit circle definition) result in the same values. Created by Sal Khan.

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

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

Let's extend trigonometric ratios sine, cosine, and tangent into functions that are defined for all real numbers. You might be surprised at how we can use the behavior of those functions to …

What is the unit circle? The unit circle is a circle with a radius of 1 centered at the origin. We can use the unit circle to help define the trigonometric functions and visualize their values. Learn …

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

This topic covers: - Unit circle definition of trig functions - Trig identities - Graphs of sinusoidal & trigonometric functions - Inverse trig functions & solving trig equations - Modeling with trig …