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## Trigonometric ratios and the unit circle

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**Trigonometric ratios and the unit circle**Mrs. WhitePrecalculus 5.2/5.4**Trig Ratios and the Unit Circle**• Goals • Students should be able to calculate the exact value of the 6 trigonometric ratios.**Example 1**• Plot P (-12, -5) in the coordinate plane. If the terminal side of an angle in standard position passes through P, find the 6 trig. Ratios.**Example 2**• Plot P (5, -2) in the coordinate plane. If the terminal side of an angle in standard position passes through P, find the 6 trig. Ratios.**Example 3**• Given the following, find the 6 trigonometric ratios: • sec Θ = -2 • sin Θ > 0**Example 4**• Find the reference angle, α. • Given: • Θ = 309o • α = 360o - 309o • α = 51o • Find the reference angle, α. • Given: • Θ = • Θ = • α =**Example 5**• Evaluate the 6 trig functions of the following angles. No Calculator. • Θ = 510° • This is coterminal with: 150° • Reference angle: 30°, Quadrant 2**Example 6**• Evaluate the 6 trig functions of the following angles. No Calculator. • Θ = • This is coterminal with: • Reference angle: , Quadrant 3**Example 7**• Sketch a right triangle corresponding to the trig function of the acute angle, Θ. Find the length of the missing side (using Pythagorean Th). Evaluate the remaining 5 trig. functions at Θ. • Given: Θ