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Visnos: Explore Pi

For Students 9th - 10th
This interactive demonstration shows firstly how pi relates to the circumference of a circle. This is achieved using a regular polygon approximation, the closed polygon is opened to reveal this magical number. The area of a circle is...
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Rice University

Rice University: Cynthia Lanius: Geometry Online

For Students 4th - 8th
This is a site for geometry lovers. Chock-full of puzzles, games, interesting geometry facts, and online activities.

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