1. December 13 th copyright2009merrydavidson Help each other on HW ?’s

2. How can I memorize these? Numerator one less than denominator Numerator one more than denominator Add N & D QII to get this numerator You have to memorize this quadrant! BUT 60 has 3 in denominator and 30 has 6 in denominator

3. Angles are labeled with: Greek letters OR Upper case letters A, B, C, etc.

4. Angles…. Put definitions on back of plate. Acute: Obtuse: Right: Quadrantal: Complementary: Supplementary: Between 0 o and 90 o Between 90 o and 180 o 90 o Terminal side on x or y axes Sum of 2 angles = 90 o or pi/2 radians Sum or 2 angles = 180 o or pi radians

5. 1 R = 180 o  R 1 o =  R 180 o 1 radian is approximately 57.3 o Mark 1R, 2R = 115 o, 3R = 172 o, 4R = 229 o, 5R = 286 o, and 6R = 344 o on your paper plate.

6. Converting from degree to radian measure Multiply by: 1) 84  ___

7. Converting from degree to radian measure Multiply by: 2) 200 

8. Converting from radian to degree measure Multiply by: 3) 6  radians ________

9. Converting from radian to degree measure Multiply by: 4) 17  radians 6

10. Arc Length A circle has a radius of 4 inches. Find the length of the arc intercepted by a central angle of 240 o.

11. Area of a Sector A sprinkler on a golf course fairway is set to spray water over a distance of 70 feet and rotates through an angle of 120 o. Find the area of the fairway watered by the sprinkler.

12. Finding complementary and supplementary angles 52 o C: S: 125 o C:S: C:S:

13. Homework: WS 6-2