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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.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.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

Next tutorial. Solving for a side in a right triangle using the trigonometric ratios ... for a test? Prepare with these 12 lessons on Right triangles & trigonometry.

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

Yes, Trigonometric Ratios isn’t particularly exciting. But it can, at least, be enjoyable. We dare you to prove us wrong.

www.ixl.com/math/algebra-1/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.