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# Pc 4.2 notes

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Introduction to the unit circle

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### Pc 4.2 notes

1. 1. 4.2 The Unit CircleEssential Question:What is the unit circle and what do the points on itrepresent? 1
2. 2. Special Right Triangles 1 1 1 2
3. 3. Convert to Radians30o45o60o 3
4. 4. The Unit Circle!-Applies x- and y-coordinates to"special angles"- All angles aremultiples of 30, 45,or 60 degrees- All points are"over 2" and havesquare root 4
5. 5. 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. 5
6. 6. 6
7. 7. The 6 Trigonometric FunctionsSo why do we need the unit circle? 7
8. 8. a)b) 8
9. 9. c)d) 9
10. 10. 10
11. 11. Assignment:4.2 p. 299 #1-51 (odd) 11
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