Learn about the unit circle and trigonometric functions with Khan Academy's comprehensive video lessons.

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Unit test. Arc measure; Arc measure with equations; Arc length; Circles: Quiz 1; Radians & degrees; Radians & arc length; Area of a sector; Circles: Quiz 2; Inscribed angles; Inscribed shapes; Tangents of circles problems; Circles: Quiz 3; Circles: Unit test; Our mission is to provide a free, world-class education to anyone, anywhere.

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.

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