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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 ...

www.khanacademy.org/math/geometry/hs-geo-trig/hs-geo-trig-ratios-intro/a/finding-trig-ratios-in-right-triangles

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).

www.khanacademy.org/math/geometry/hs-geo-trig/hs-geo-trig-ratios-intro/v/basic-trigonometry

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.purplemath.com/modules/basirati.htm

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

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.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 ...

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.shmoop.com/trig-functions/trig-ratios.html

But seriously, that stuff isn't at the core of trig. Real trig rocks to the tune of sine, cosine, and tangent. Say what? The three basic trigonometric ratios are sine, ...

mathsfirst.massey.ac.nz/Trig/TrigRatio.htm

Trigonometric Ratios. If one of the angles of a triangle is 90º (a right angle), the triangle is called a right angled triangle. We indicate the 90º (right) angle by ...

www.chegg.com/homework-help/definitions/trigonometric-ratios-63

The six trigonometric ratios relate the sides of a right triangle to its angles. Specifically, they are ratios of two sides of a right triangle and a related angle.