Angles in standard position use the positive side of the x-axis as the inital arm.  Counter-clockwise rotations from this initial arm produce positive angles, and clockwise rotations produce negative angles.  Sometimes, different angles can end up with the same terminal arm.  These are called coterminal angles.


  • Notes


  • p175 #7-9, 11, 18-20 C5

Things you should know how to do after today:

  • define an angle in standard position
  • define a coterminal angle
  • Find the reference angle for an angle in standard position
  • Find the smallest positive coterminal angle for any angle in standard position
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