Key point is the inscribed angle is half of its intercepted arc.
Use the link for help/practice
https://www.youtube.com/watch?v=aRGI4lafk8Y
https://www.khanacademy.org/math/geometry/cc-geometry-circles/central-inscribed-circumscribed/v/inscribed-and-central-angles
https://www.youtube.com/watch?v=XRk5zhXzhWA
http://www.cliffsnotes.com/math/geometry/circles/arcs-and-inscribed-angles
HW: turn in any missing work from 11.1 - 11.3. Complete WS 11.5 side B only. Vocabulary quiz tomorrow.