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en.wikipedia.org/wiki/Trigonometry
Trigonometry (from Greek trigōnon, "triangle" and metron, "measure") is a branch of mathematics that studies relationships between side lengths and angles of triangles. The field emerged in the Hellenistic world during the 3rd century BC from applications of geometry to astronomical studies.
www.mathsisfun.com/algebra/trigonometry.html
Trigonometry helps us find angles and distances, and is used a lot in science, engineering, video games, and more! RightAngled Triangle. The triangle of most interest is the rightangled triangle.The right angle is shown by the little box in the corner:
www.livescience.com/51026whatistrigonometry.html
Trigonometry is a branch of mathematics that studies relationships between the sides and angles of triangles. Trigonometry is found all throughout geometry, as every straightsided shape may be ...
www.basicmathematics.com/whatistrigonometry.html
About 3000 years ago, trigonometry was used in astronomy and surveying among a few others. Today, trigonometry has expanded to include a vast number of physical phenomena including sound waves, light rays, pendulums, and orbits of atomic particles. The fields that trigonometry is being used today include electronics, engineering, and calculus.
cuttheknot.org/WhatIs/WhatIsTrigonometry.shtml
What Is Trigonometry? We learn from The Words of Mathematics:. trigonometry (noun), trigonometric (adjective): the first part of the word is from Greek trigon "triangle". The second part of trigonometry is from Greek metron "a measure." The IndoEuropean root is probably me"to measure." Trigonometry is literally the measuring (of angles and sides) of triangles.
en.wikipedia.org/wiki/Trigonometric_functions
The most familiar trigonometric functions are the sine, the cosine, and the tangent. Their reciprocal are respectively the cosecant, the secant, and the cotangent, which are less used in modern mathematics. The oldest definitions of trigonometric functions, related to rightangle triangles, define them only for acute angles.
www.omnicalculator.com/math/trigonometry
Trigonometry is a branch of mathematics. The word itself comes from the Greek trigōnon (which means "triangle") and metron ("measure"). As the name suggests, trigonometry deals mostly with angles and triangles; in particular, it's defining and using the relationships and ratios between angles and sides in triangles. The primary application is ...
study.com/academy/lesson/whatistrigonometryfunctions...
Many math symbols come from the Greek language and, not surprisingly, the word trigonometry also has its roots in that language. The first part of the word trigon is Greek for 'triangle.'
homeworkdoer.org/math/whatistrigonometry.html
Trigonometry is an essential study of geometry as every shape can be broken into different collections of triangles. Moreover, trigonometry has astoundingly interrelationships with other mathematics branches especially in logarithms, infinite series, and calculus. History of Trigonometry. Trigonometry just like algebra follows the same path.
www.britannica.com/science/trigonometry
Trigonometry, the branch of mathematics concerned with specific functions of angles and their application to calculations. There are six functions of an angle commonly used in trigonometry. Their names and abbreviations are sine (sin), cosine (cos), tangent (tan), cotangent (cot), secant (sec), and cosecant (csc). These six trigonometric functions in relation to a right triangle are displayed ...

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