The Screen Protractor is a fantastic teaching aid for mathematics and geography as it can be used to measure angles on top of any other image. In the following complete lesson plans we've used the protractor over Google Earth allowing students to measure angles between real-life geographical locations.

You may download and print out the following classroom materials and distribute them in a classroom setting free of charge. You should have everything you need to run the entire lesson.

• Getting Started Document
• Google Earth Day OneSheet
• Indonesia Lesson Plan
• English Channel Student Sheet
• English Channel Teacher Lesson Plan
• Intro Google Earth Movie
• Greek Islands Lesson Document
• Google Earth Location Files for all Lessons
• San Francisco Measurement Movie
• Turkey Measurement Movie

To save to your computer right-click the links and select 'Save Target As...'

Thanks to Rick White and Philip Kurbis at Munich International School for creating the lesson plans.