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 circular motion
Tangent identities: symmetry (video) | Khan Academy In short, the unit circle of an extension of the methods used to figure out the angles of right triangles Sal has many videos explaining this very process on his Trigonometry course if anyone is interested
Circles | High school geometry | Math | Khan Academy About this unit Explore, prove, and apply important properties of circles that have to do with things like arc length, radians, inscribed angles, and tangents