Khan/khan-exercises — pull request #84478 by petercollingridge (2013-10-02 19:32:19+00:00)
Title: Rigid transformations

For trello card: https://trello.com/c/eLefJvJB/312-transforming-figures

Includes exercises with one line segment, one set of parallel lines or one angle. Students have to translate and rotate (not yet reflect) it to get to a target state. ~30% of the time it's not possible.