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Wishing you could visit the Exploratorium in San Francisco but can't afford the trip?  Tide yourself over with their amazing online math resources, such as the Geometry Playground, which really bring math to life on your computer!

Nice simple summaries on geometric concepts

Great manipulative's to interact with geometry concepts.

Cool site relating Geometry, symmetry, the number 42, and other cool stuff.

Geometry of baseball

this website helped me explain to my students why constructions are important in Geometry!

Interactive geometry software

Geometry Help with 2D Shapes

While not particularly user-friendly creation-wise, it is pretty easy to pick up on what you can do. It has math topics: integers, fractions, concepts, and geometry. Within each, you can choose specific concepts, level of difficulty, and the number of problems. Then, simply send students to the URL, and they can take a fill-in-the blank quiz and see results immediately.

A great math activity idea that revolves around using Play-Doh to help students learn about solid cross-sections.  I've always had a hard time visualizing these types of things, and I wish my teachers had used this lesson idea!  I can't wait to try it!

A collection of math related topics from basic arithmetic to geometry and combinatorics. Presents the concepts in an easy to understand way, also provides applets demonstrating concepts.

Math Games Website for Seventh and Eighth Graders...also has lots of games for Geometry, Algebra 1 and Algebra 2.

GeoGebra is a good way to learn geometry

the mathematics of crop circles. Geometry.

Chaco Canyon design, astronomy, and geometry

Using technology to explore geometry of Navajo Weavings

Native American Geometry

Vi Hart Geometry intro

Activity to facilitate further understanding of circles