1. 7.1 Angles & Triangles

2. Angles Positive Angle Counterclockwise rotation Negative Angle Clockwise rotation  

3. Degrees 1  = 60 = 3600  DegreesMinutes Seconds 1 Revolution = 360 

4. Complementary & Supplementary Angles The sum of 2 positive angles = 90  Complementary : The sum of 2 positive angles = 180  Supplementary :

5. Ex 1) Find the  A that is complementary to  B = 27  2014   A +  B = 90  Complementary : Rewrite 90  as 89  5960  89  596 0   27  2014  46  39 62   A =

6. Ex 2) Find the  A that is supplementary to  B = 87  4916   A +  B = 180  Supplementary : Rewrite 180  as 179  5960  179  596 0   87  4916  44  10 92   A =

7. Ex 3) Change 23.24  into degree-minute-second format. 23.24  = 23  + 0.24  = 23  + 0.24(60) = 23  + 14 + 0.4 = 23  + 14.4 1  = 60 = 23  + 14 + 0.4(60)  = 23  1424  1 = 60 

8. Ex 4) Change 143  2715  into decimal-degree format.

9. Homework #701 Pg. 385 1 – 39 odd