MATHEMATICS TRICKS
CONSTRUCTION OF PARALLELOGRAM
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TRIGONOMETRY RATIOS
Trigonometric ratios Main article: Trigonometric function In this right triangle: sin A = a / c ; cos A = b / c ; tan A = a / b . Trigonometric ratios are the ratios between edges of a right triangle. These ratios are given by the following trigonometric functions of the known angle A , where a , b and c refer to the lengths of the sides in the accompanying figure: Sine function (sin), defined as the ratio of the side opposite the angle to the hypotenuse . {\displaystyle \sin A={\frac {\textrm {opposite}}{\textrm {hypotenuse}}}={\frac {a}{c}}.} Cosine function (cos), defined as the ratio of the adjacent leg (the side of the triangle joining the angle to the right angle) to the hypotenuse. {\displaystyle \cos A={\frac {\textrm {adjacent}}{\textrm {hypotenuse}}}={\frac {b}{c}}.} Tangent functi...
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