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Trignometric rules

# Trignometric rules - Practical Trig Preliminary Denitions A...

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Practical Trig Preliminary Definitions A Right Triangle: Any triangle that possesses two sides separated by a 90 angle. The reference angle ( θ ): One of the two remaining angles of a right triangle ( θ = 90 ). The hypotenuse (hyp): The side of a right triangle opposite the 90 angle. The opposite side (opp): The side of a right triangle opposite the reference angle ( θ ). The adjacent side (adj): The side of a right triangle adjacent the refer- ence angle ( θ )

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Primary Trig Functions Each trig function is defined ( ) as a ratio of the lengths of two sides of a right triangle. Generalize “hyp”, “opp” and “adj” to mean the lengths of the hy- potenuse, opposite and adjacent sides of a right triangle, respectively. Then. . . sin θ opp hyp cos θ adj hyp tan θ opp adj Less Important Trig Functions While these functions are also ratios of the lengths of the sides of a right triangle, you’ll usually see them defined in terms of the primary trig functions. Because
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Trignometric rules - Practical Trig Preliminary Denitions A...

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