7.1 Angles & Triangles

Angles Positive Angle Counterclockwise rotation Negative Angle Clockwise rotation  

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

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

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

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

Ex 3) Change  into degree-minute-second format  = 23   = 23  (60) = 23  = 23   = 60 = 23  (60)  = 23  1424  1 = 60 

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

Homework #701 Pg – 39 odd