Finding coterminal angles video link below!
http://www.educreations.com/lesson/view/coterminal-angles-how-to-find-them/10263528/?ref=appemail
angle in standard position
http://www.mathopenref.com/trigangle.html
Check out the link below for another explanation about the unit circle.
Unit Circle Review by cool math
Check out the study games and study aids below.
http://www.purposegames.com/game/angles-of-the-unit-circle-radians-quiz
http://www.studystack.com/studystack-37485
angle in standard position
http://www.mathopenref.com/trigangle.html