What is trigonometry?

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Trigonometry (from Greek trignon, "triangle" and metron, "measure") 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.
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Teacher

The branch of mathematics dealing with the relations of the sides and angles of triangles and with the relevant functions of any angle.
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Maths Teacher with 9 years of experience

It deal with right angle triangle and gives relation between angles and sides of a right angle triangle.
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Maths Expert

Tri-gon-metry these words tell you that it is the study of a polygon with three sides aka a triangle. So trigonometry is study of triangles and all the relation between the angles and sides that you study through the terms sin ,cos, tan etc.
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Microsoft Certified in Analyzing and Visualizing Data with Excel

Trigonometry (from Greek trig, "triangle" and metron, "measure") 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.
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French language specialist and tutor with 6 years of French Teaching experience

It is a branch of mathematics dealing with relationship between length and angle of triangle.
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Tutor

Trigonometry is the branch of mathematics dealing with the relations of the sides and angles of triangles and with the relevant functions of any angles.
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Relationship between sides and angles in a triangle.
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Tutor

Trigonometry is all about a triangle. Trigonometry is the measure of triangles (tri)-triangles and (metry)-measure in latin. So the trigonometry is a method that gives an understanding of knowing or calculating the all aspects of a triangle i.e., its sides, angles, heights.
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Tutor

Mathematics branch dealing with relations between sides and angles of triangles.
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