Based on your work I thought you may be interested in this game. It's called Anti-homework Elementary:
Setting: A school-like atmosphere. There are teachers hiding behind various obstacles in a school trying to give the user homework. There is a math teacher, a reading teacher, a science teacher, a history teacher, and a writing teacher. The user has an anti-homework grenade that can be launched at teachers that destroys the homework.
The user must use his knowledge of angles to accurately launch the anti-homework grenades. The screen will have an invisible protractor (the tool for measuring angles). There will be text fields where each of the teachers are hiding. The location of each teacher will have a precise angle measure (that must change each time the game is played). The user will have to type in the estimated angle measure. There are five total rounds, with each round getting progressively more difficult (and taking place in a different school scene). The user will progress to the next round if he or she is within 25 degrees of the actual teacher location. Round two - 20 degrees, round 3 - 15 degrees, round 4-10 degrees, and round 5- 5 degrees. The game must have vivid graphics and be easy for kids to use. Let me know ASAP if you are interested.