Use the links below for more examples:
http://www.brightstorm.com/math/geometry/circles/central-angles-and-intercepted-arcs/
http://www.youtube.com/watch?v=4Y9D0v0x4H8
http://www.glencoe.com/sites/north_carolina/support_student/additional_lessons/Course_3/C3_OnlineLesson_3.pdf
Homework: WS 11.3 (we will go over this tomorrow in class).