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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! Right-Angled Triangle. The triangle of most interest is the right-angled triangle.The right angle is shown by the little box in the corner:

www.livescience.com/51026-what-is-trigonometry.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 straight-sided shape may be ...

www.basic-mathematics.com/what-is-trigonometry.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.

cut-the-knot.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 Indo-European 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 right-angle 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 ...