14 January 2017: If you drag a free point (such as x or C) out of the window, it now snaps back to the window boundary.
01 April 2016: Updated to 4.5.0
10 April 2016: Shortened and improved worksheet, added an introduction to Dilation Games in main sketch
15 December 2015: Modified Game 2 of Dilate Games to show scale as a fraction in feedback.
14 December 2015: Divided up the worksheet into three separate tasks.
18 October 2015: Created this page.