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Chapter 8.3: Trigonometric Ratios Introduction • Trigonometry is a huge branch of Mathematics. In Geometry, we touch on a small portion. Called the “Trigonometric Functions”. They are three formulas that can be used to find the side lengths of right triangles. They’re called: • Sine, Cosine, and Tangent Sin, Cos , Tan properties • SIN = length of the side opposite an angle length of the hypotenuse • COS = length of the adjacent side to an angle length of the hypotenuse • TAN = length of the side opposite and angle length of the side adjacent to an angle represent an Angle measure Abbreviation • Soh-Cah-Toa is a way to help you memorize the trig. Formulas. • SOH Sin = opp hyp • CAH Cos = adj hyp • TOA Tan = opp adj Defining Adjacent and Opposite • Name the line segment: C – Adjacent to Angle A= – Opposite to Angle A= – Adjacent to Angle C= – Opposite to Angle C= A B How to read the Trig Table Sin 34= Cos 86= Tan 57= Classwork/Homework • Pgs 434-435 #1-22 (potentially less) • Pgs 441-442 #2-28e (potentially less)