Basic

A sextant

Trigonometric

ratios (cont.....)

The reciprocals of these functions are named the cosecant (csc or cosec), secant (sec), and cotangent (cot), respectively.

Video analysis

A short video

Applications of trigonometry

Trigonometric

ratios

• Trigonometry is used by setting directions such as north south east west, it tells you what direction to take with compass to get on a straight direction.
• Trigonometry is used in navigation in order to pinpoint a location.
• Usually, this is done by means of three different coordinates.
• One example of trigonometry in navigation is the sextant.

Basic

Overview

• Sine function (sin), defined as the ratio of the side opposite the angle to the hypotenuse.
• Cosine function (cos), defined as the ratio of the adjacent to the hypotenuse.
• Tangent function (tan), defined as the ratio of the opposite to the adjacent.

• Trigonometry is a branch of mathematics that studies relationships involving lengths and angles of triangles.
• The field emerged in the Hellenistic world during the 3rd century BC from applications of geometry to astronomical studies.

Applications of trigonometry

• There is an enormous number of uses of trigonometry and trigonometric functions.
• For instance, the technique of triangulation is used in astronomy to measure the distance to nearby stars, in geography to measure distances between landmarks, and in satellite navigation systems.

Trigonometry