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# Trig Ratios Of Obtuse Angles

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• 1. 1
• 2. Trigonometric Ratios of an Obtuse Angle Definition: An angle is in standard position if • its first side (initial side) is a ray from the origin along the positive x­axis • its second side (terminal side) is any ray from the origin • the angle is measured from the initial to the terminal side in a counterclockwise direction ] Angle is in standard position. 2
• 3. 3
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• 6. Use the coordinate definition of the trigonometric ratios  to find sin , cos and tan if angle is in standard position  • P(3, 4) is on • P(-3, 4) is on its terminal arm its terminal arm 6
• 7. Θ  sinΘ  cosΘ   tanΘ   0 30 0 150   0 65   0 115   0 89   0 91   7
• 8. • Find the size of each angle (nearest tenth) • State acute and obtuse angles where possible 1)  sin = 0.42 2)  cos = ­0.3 3)  tan = 1.5 8
• 9. Assignment: Exercise 18 9