We have been studying special angle pairs in my freshmen Geometry class. Yesterday I told them I LOVE puzzles and I gave them this homework.
For each angle they had to give a specific reason for the angle measure ("vertical angles with <1", etc).
When they came in this morning, they were all abuzz! "Did you get angle 12? yeah, but I got stuck on angle 15...." and other such snippets of conversation were overheard.
Finally one kid turned to me and said: "This took me a long time, especially coming up with a reason for each angle, but it was cool! I can see why you like puzzles: they are WAY better than doing a work sheet!"
Gotta love 'em!!