4.2The Trigonometrical RatiosIntroductionThe trigonometrical ratios sine, cosine and tangent appear frequently in many engineering problems. This leaflet revises the meaning of these terms.1. Sine, cosine and tangent ratiosStudy the right-angled triangle ABC shown below.Chypotenuseside opposite to ABside adjacent t The side opposite the right-angle is called the hypotenuse. The side opposite to is BC.The remaining side, AB, is said to be adjacent to .Suppose we know the lengths of each of the sides as in the figure below.C108A6BWe can then d ...
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