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Sine, Cosine and Tangent (often shortened to sin, cos and tan) are each a ratio of sides of a right angled triangle: For a given angle θ each ratio stays the same. no matter how big or small the triangle is. To calculate them: Divide the length of one side by another side. Example: What is the sine of 35°?
The sine and cosine of an acute angle are defined in the context of a right triangle: for the specified angle, its sine is the ratio of the length of the side that is opposite that angle to the length of the longest side of the triangle (the hypotenuse), and the cosine is the ratio of the length of the adjacent leg to that of the ...
Learn how to use the law of sines and the law of cosines to solve problems with any triangle. See examples, practice sets, videos and tips on finding missing angles and sides.
Learn how to use sine, cosine and tangent to find angles and distances in right-angled triangles. See examples, graphs, unit circle, degrees and radians, and solving triangles.
Sine and cosine — a.k.a., sin(θ) and cos(θ) — are functions revealing the shape of a right triangle. Looking out from a vertex with angle θ, sin(θ) is the ratio of the opposite side to the hypotenuse, while cos(θ) is the ratio of the adjacent side to the hypotenuse.
Learn how to use sin, cos, and tan to relate angles and sides of right triangles. Watch a video, see diagrams, and read comments and questions from other learners.
Three common trigonometric ratios are the sine (sin), cosine (cos), and tangent (tan). These are defined for acute angle A below: In these definitions, the terms opposite, adjacent, and hypotenuse refer to the lengths of the sides. SOH-CAH-TOA: an easy way to remember trig ratios.
