Trigonometric functions | Trigonometry | Math | Khan Academy
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 triangles and …
Unit circle (video) | Trigonometry | Khan Academy
Learn how to use the unit circle to define sine, cosine, and tangent for all real numbers.
Unit circle trigonometry | Lesson (article) | Khan Academy
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. We can use radian measures to …
Unit circle (practice) | Trigonometry | Khan Academy
Practice your understanding of the unit circle definition of sine and cosine.
Trig unit circle review (article) | Khan Academy
Review the unit circle definition of the trigonometric functions.
Unit circle (with radians) (practice) | Khan Academy
Get more practice with the unit circle definition of sine and cosine, this time with radians instead of degrees.
The trig functions & right triangle trig ratios - Khan Academy
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.
Unit circle (practice) | Khan Academy
Practice your understanding of the unit circle definition of sine and cosine.
Trigonometry | Khan Academy
Explore the world of trigonometry by mastering right triangles and their applications, understanding and graphing trig functions, solving problems involving non-right triangles, and unlocking the power of …
Trigonometry | Algebra 2 | Math | Khan Academy
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 model real …