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- 1. Chapter 4.3Trigonometry Extended: The Circular Functions
- 2. Standard Position An angle with its vertex at the origin. The initial side lies along the positive x-axis.
- 3. Quadrantal Angle When the terminal side coincides with one of the axes. 900 00 or 1800 3600 2700
- 4. Acute Angle If the terminal side falls in the first quadrant it is said to be an acute angle. Generally talking about an angle formed in the normal way (standard position), positive or counter clock wise.
- 5. Obtuse Angle If the terminal side falls in the second quadrant it is said to be an obtuse angle. Generally talking about an angle formed in the normal way (standard position), positive or counter clock wise.
- 6. Coterminal Angles Two angles in standard position that share the same terminal side. Angles that differ by multiples of 3600. Every angle has infinitely many coterminal angles. (α + 360ko) α – angle k - integer
- 7. Reference Angle For any angle α , 0o < α < 360o The reference angle is the acute angle formed by the terminal side and the closest x-axis.
- 8. The Unit Circle A circle with a radius of 1 It’s center is at the origin Symmetric to the x-axis, the y-axis, and theorigin
- 9. Sine and Cosine Ifthe terminal side of an angle θ in standard position intersects the unit circle at P(x, y), then cos θ = x and sin θ = y. Sine and cosine always range between -1 and 1.
- 10. Trig Functions of an Angle inStandard Position
- 11. Trig Functions of an Angle inStandard Position

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