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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
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