https://www.khanacademy.org/math/algebra2/x2ec2f6f830c9fb89:trig/x2ec2f6f830c9fb89:unit-circle/v/unit-circle-definition-of-trig-functions-1 2021-06-30T17:32:39Z Unit circle Learn how to use the unit circle to define sine, cosine, and tangent for all real numbers. Sal Khan video https://cdn.kastatic.org/googleusercontent/4va3CHgzmCX8w1NMhs0LlyYxLMiXHDwZ-dDm8quQ0X5OKdz1Yj1KGmmUatzGzQcx5s4jzRHet0bYdh0NK-KNxB3iTw Unit circle Learn how to use the unit circle to define sine, cosine, and tangent for all real numbers. https://cdn.kastatic.org/ka-youtube-converted/1m9p9iubMLU.mp4/1m9p9iubMLU.mp4 544 Unit circle introduction https://www.khanacademy.org/math/algebra2/x2ec2f6f830c9fb89:trig/x2ec2f6f830c9fb89:unit-circle/e/unit-circle 2026-04-08T00:54:09.631945657Z Unit circle Practice your understanding of the unit circle definition of sine and cosine. Tomer Gal exercise https://www.khanacademy.org/math/algebra2/x2ec2f6f830c9fb89:trig/x2ec2f6f830c9fb89:unit-circle/v/matching-ratios-trig-functions 2021-06-30T17:32:35Z The trig functions & right triangle trig ratios 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. Sal Khan video https://cdn.kastatic.org/googleusercontent/c0UdQAIw0Z9Y4urOKTHbmOHKFTJHkq7hOgH3dDSYlUf2TnGutCehCIcgi4p5iBxnlOEdinR2IhzIwUgqGyl3NnBy The trig functions & right triangle trig ratios 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. https://cdn.kastatic.org/ka-youtube-converted/WffVdYETdng.mp4/WffVdYETdng.mp4 417 Unit circle introduction https://www.khanacademy.org/math/algebra2/x2ec2f6f830c9fb89:trig/x2ec2f6f830c9fb89:unit-circle/a/trig-unit-circle-review 2023-01-04T23:01:08.478517925Z Trig unit circle review Review the unit circle definition of the trigonometric functions. article