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en.wikipedia.org/wiki/Trigonometry

Trigonometry is a branch of mathematics that studies relationships involving lengths and .... These ratios are given by the following trigonometric functions of the known angle A, where a, b and c refer to the lengths of the sides in the ...

The ratios of the sides of a right triangle are called trigonometric ratios. Three common trigonometric ratios are the sine (sin), cosine (cos), and tangent (tan).

Intro to the trigonometric ratios. AboutTranscript. Sal introduces sine, cosine, and tangent, and gives an example of finding them for a given right triangle.

www.softschools.com/math/calculus/the_6_trig_ratios

For any right triangle, there are six trig ratios: Sine (sin), cosine (cos), tangent (tan ), cosecant (csc), secant (sec), and cotangent (cot). Here are the formulas for ...

www.varsitytutors.com/hotmath/hotmath_help/topics/trigonometric-ratios

Trigon is greek for triangle, and metric is greek for measurement. The trigonometric ratios are special measurements of a right triangle.

www.purplemath.com/modules/basirati.htm

Demonstrates how to use trig ratios to do simple solving of triangles.

sites.csn.edu/istewart/Math127/trig_ratios/ratios.htm

In mathematics, the trigonometric ratios (also called trigonometric functions) were created with the sole purpose of allowing us to show certain relationships ...

www.ixl.com/math/geometry/trigonometric-ratios-sin-cos-and-tan

Fun math practice! Improve your skills with free problems in 'Trigonometric ratios: sin, cos, and tan' and thousands of other practice lessons.