pc 4.2 notes
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4.2 The Unit CircleEssential Question:What is the unit circle and what do the points on it represent?
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Special Right Triangles
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Convert to Radians
30o
45o
60o
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The Unit Circle!-Applies x- and y- coordinates to "special angles"
- All angles are multiples of 30, 45, or 60 degrees
- All points are "over 2" and have square root
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Creating the Unit Circle:1) Start in Quad. I and with the y-coordinate of 0.
2) Count to 4 with the y up to 90 degrees or π/2.
3) Count back down on x from 0 to 4.
4) Square root everything, then put over 2.
5) Reflect points to the different Quadrants.
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The 6 Trigonometric FunctionsSo why do we need the unit circle?
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a)
b)
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c)
d)
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Assignment:
4.2 p. 299 #1-51 (odd)
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