The term trigonometry is derived from the Greek "wheat" which means "triangle" and "metron" which means "measure", which is why it is said to be a division of mathematics, which is responsible for studying the relationship that exists between the measurements of the sides that make up a triangle and its angles, its application is used in multiple sciences, such as astronomy and geometry.
Seen more deeply, this science is the one that studies the trigonometric ratios (sine, cosine, secant, cosecant, tangent and cotangent) in addition to intervening directly or indirectly in other branches of mathematics where the use of precise measurements is required, Such is the case of triangulation, used in astronomy to measure the distance between stars, it can also be applied in the geometry of space.
The origin of trigonometry dates back to the time of ancient Egypt and Babylon, because by then knowledge about the proportions of triangles was already known, but they did not have an angle measure, therefore the sides of a triangle were studied in their Measure, these civilizations applied that knowledge to study the setting and rising of the celestial bodies, movement of the planets, it is believed that to make these calculations, the Babylonians used a kind of secant table. Another curious fact is that the Egyptians used a kind of primitive trigonometry for the construction of the pyramids.
In trigonometry , three units are usually used to measure angles, the first of them is the radian, which is considered the natural unit to measure angles, this unit indicates that a circumference can be divided into two pi radians, or what is the same 6.28. The sexagesimal degree is another of the units, it is an angular unit, which allows a circumference to be divided into three hundred and sixty degrees. Finally, there is the centesimal degree, which, like the previous unit, divides a circumference, but does so in four hundred grads.
The sine, cosine and tangent are the main trigonometric ratios that this branch of mathematics studies. The sine is the one in charge of calculating the ratio between the hypotenuse and the leg. The cosine, calculates the ratio between hypotenuse and adjacent leg. Tangent, calculates the ratio between both legs (adjacent and opposite).
