Khan/khan-exercises — pull request #24434 by beneater (2012-06-20 20:59:18+00:00)
Title: fix #23568

Add a degree symbol next to the answer box so people don't think to use grads or arcseconds or radians or something.

http://sandcastle.khanacademy.org/media/castles/beneater:fix-3568/exercises/angle_addition_postulate.html