trig ratios of obtuse angles
Post on 18-May-2015
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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.
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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 its terminal arm
• P(-3, 4) is on its terminal arm
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Θ sinΘ cosΘ tanΘ 300
1500 650 1150 890 910
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• 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
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Assignment:
Exercise 18
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