Khan/khan-exercises — pull request #15545 by llarsen71 (2012-03-06 16:05:31+00:00)
Title: Updated the unit_circle exercise to use custom answer type for setting the angle in timeline.

One item on trello Card #381:

The unit circle exercise stored the cosine or sine value that was typed in, but did not save the location where the student placed the unit circle. The exercise now requires the student to set the unit circle to the correct angle (although it recognizes that 90 and -270 degrees are the same), and to have the correct answer in the box.