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.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.