GeoGebra - software for visualising geometry and algebra

Geodesic ball - a design for a geo ball made from barbecue skewers

Paper Boy's - a pattern for making a paper model of Boy's surface

Proof of Pythagorus - a graphical proof of the Theorem of Pythagorus

Random Normal and Boxplots - how to calculate a random number from a normal distribution in Excel

Sliding Triangles


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