First of all, to understand such concepts such as the trig. ratios, sine rule, and cosine rule, we need to know what trigonometry actually is. Trigonometry is a branch of mathematics that studies the relations of the sides and angles of triangles and the relevant functions of those angles. Trigonometry is a branch of Geometry, but it finds the measurements of its sides or angles with a combination of both instead of only relying on one.
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