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The Unit Circle (Section 4.2) Warm-up: Use the Pythagorean Theorem to find the lengths of the missing sides. Unit Circle: Find the coordinates of the indicated points. Why do we need these coordinates? __________________________________________ Review the Trigonometric Ratios: SOHCAHTOA 1. sin θ = _______ 2. cos θ = _______ 3. tan θ = _______ Definitions of Trigonometric Functions sin θ = y csc θ = 1 y cos θ = x tan θ = y x 1 x cot θ = x y secθ = The Unit Circle (Section 4.2) The Complete Unit Circle Example: Evaluate the six trig functions at the following angle measures. a) π 6 b) 5π 4 c) π d) − π 3