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Trigonometry and trigonometric ratios.

The Trigonometry is a branch of mathematics, whose etymological meaning is "the measurement of triangles " .

Trigonometry is the branch of mathematics s that studies the relationships between angles and sides of triangles. For this it uses the trigonometric ratios, which are frequently used in engineering calculations.

In Overall, the trigonometry is the study of functions within , cosine ; tangent , cotangent, secant and cosecant. Directly or indirectly involved in the other branches of mathematics and applies in all areas where measures are required accuracy. Trigonometry applies to other branches of geometry , as is the case study areas in geometry of space .

has many applications: triangulation techniques, for example, are used in astronomy to measure distances to stars next, in measuring distances between points geographic and navigation systems by satellite .

Trigonometric ratios

The triangle ABC is a triangle in C, we will use to define the reasons sine, cosine and tangent of the angle , corresponding to the vertex A , located in the center of the circle.

• The within (abbreviated as sen or without to be called "breasts" in Latin) is the ratio of leg on the opposite hypotenuse,

• The cosine (abbreviated cos ) is the ratio of the hypotenuse adjacent side,

• The tangent (abbreviated as or tg) is the ratio between the leg opposite the side adjacent,