This in an online collection of lessons covering essential concepts in any high school Geometry course. Every lesson has web exercises, where students can get unlimited practice online. There are randomly-generated worksheets with solutions for practice away from the computer, or for quizzes. Mathematics is displayed correctly using MathML (Math Markup Language), which is the future of math on the web. Many lessons incorporate the Geometer's Sketchpad, which is hands-on geometry at its finest.

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