
1) Branch of mathematics 2) Pure mathematics 3) Trig
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1) Triangulation
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Trigonometry (from Greek trigōnon, `triangle` and metron, `measure`) is a branch of mathematics that studies relationships involving lengths and angles of triangles. The field emerged during the 3rd century BC from applications of geometry to astronomical studies. The 3rd-century astronomers first noted that the lengths of the sides of a righ...
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http://en.wikipedia.org/wiki/Trigonometry

• (n.) A treatise in this science. • (n.) That branch of mathematics which treats of the relations of the sides and angles of triangles, which the methods of deducing from certain given parts other required parts, and also of the general relations which exist between the trigonometrical functions of arcs or angles.Trigonometry: words in t...
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the branch of mathematics concerned with specific functions of angles and their application to calculations. There are six functions of an angle ... [9 related articles]
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http://www.britannica.com/eb/a-z/t/80

The branch of mathematics that deals with the relationships between the sides and the angles of triangles and the calculations based on them, particularly the trigonometric functions. Sherlock Holmes relies on a little trigonometry to solve a 250-year-old mystery known as the Musgrave Ritual (in a s...
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Origin: Gr. A triangle + -metry: cf. F. Trigonometrie. See Trigon. ... 1. That branch of mathematics which treats of the relations of the sides and angles of triangles, which the methods of deducing from certain given parts other required parts, and also of the general relations which exist between the trigonometrical functions of arcs or angles. ...
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Trigonometry is the branch of mathematics which treats of the relation of the sides and angles of triangles, with the methods of deducing from certain parts the parts required.
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[
n] - the mathematics of triangles and trigonometric functions
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http://www.webdictionary.co.uk/definition.php?query=trigonometry

trigonometry That branch of mathematics that deals with the measurement of the sides and angles of triangles, particularly with certain functions of their angles or of angles in general (the sine, cosine, tangent, cotangent, secant, and cosecant), and hence with these functions as applied to abstract quantities; thus including the theory of triangl...
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trig noun the mathematics of triangles and trigonometric functions
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Branch of mathematics that concerns finding lengths and angles in triangles. In a right-angled triangle the sides and angles are related by three trigonometric ratios: sine, cosine, and tangent. Trigonometry is used frequently in navigation, surveying, and simple harmonic motion in physics. U...
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https://www.encyclo.co.uk/local/21221

the branch of mathematics that studies the relationships between the sides and the angles of right triangles, and deals with and with the trigonometric functions (sine, cosine, tangent and their reciprocals)
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https://www.storyofmathematics.com/glossary.html
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