I chose launch number 514. This was a web lesson on Congruency in Transformations. This was a pretty cool lesson. It launches in its own window and gives students a chance to practice translating various line segments and figures. Then there is also a quiz portion. I really like this feature because the students can use this to assess how well they have learned the content.
My favorite part however is the answer page. The student can open it and check their progress and fix their answers, but the original is still saved as well as the updated version. Additionally I like the fact that the student can save or EMAIL (!!) the answer page. This is really convenient that the program marks what is correct/incorrect and then can be emailed to the teacher - great time saver!
I would use this to help the students learn/review Transformations one day and then give them a quiz on what they have learned the next day. I saw some really great other tools on this site and I am very excited with how I can integrate this into my classroom! (http://www.sascurriculumpathways.com)