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Google SketchUp is a free, fun, easy-to-use 3D modeling application. Originally created for architects and designers, SketchUp is also a great tool for teaching geometry.
The resources on this page will help you bring SketchUp into your classroom and show you some wonderful projects in 2D and 3D geometry.
"a freely available public site that is designed specifically for Music Teachers and pre-service Music Teachers interested in continual professional developent in their field of music education. While this site is free to use, all users must register for an account -for all non-logged users, clicking any of the links will take you back to this page."