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A mathematical science that reveals relation between angles and lengths of sides of a triangle is called Trigonometry.
The word Trigonometry was derived from two Greek words "Trigonon" and "Metron". According to Greek Language, The meaning of Trigonon and Metron are a triangle and measure respectively. Measuring a triangle, which means measuring lengths of its sides, angles and investigating the relation between them is purpose of trigonometry in mathematics.