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Unformatted text preview: Practical Trig Preliminary Definitions A Right Triangle: Any triangle that possesses two sides separated by a 90 angle. The reference angle ( ): One of the two remaining angles of a right triangle ( 6 = 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 ( ). The adjacent side (adj): The side of a right triangle adjacent the refer- ence angle ( ) 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 opp hyp cos adj hyp tan opp adj Less Important Trig Functions While these functions are also ratios of the lengths of the sides of a right triangle, youll usually see them defined in terms of the primary trig functions. Becauseyoull usually see them defined in terms of the primary trig functions....
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- Spring '10