Khan/khan-exercises — pull request #11127 by Mathman06 (2012-01-13 08:40:20+00:00)
Title: Removes multiple choice from radians_and_degrees.html exercise

This might stir up controversy, but I have added problems to these exercises that use radians in terms of tau. Personally, I find the tau conversions easier, but sadly, pi is still the established standard. For more information on tau, see: http://www.khanacademy.org/video/tau-versus-pi?playlist=New%20and%20Noteworthy