Khan/khan-exercises — pull request #99291 by petercollingridge (2013-10-28 15:17:38+00:00)
Title: Compass constructions

New exercise types for copying a line segment, copying an angle and creating parallel lines.

The parallel lines exercise only accepts a proof based on copying an angle.

For Trello card: https://trello.com/c/UYJdjzKG/390-modify-existing-exercise-compass-constructions