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Spinning color wheel
Author:
Christian Mercat
A wheel is divided in sectors of 3 colors, red, green and blue. Then it spins. At the right speed, the colors somehow disappear.
GeoGebra
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History of Maths
Pelecoid
Ellipse, Hyperbola and Circle as Envelopes
Bottema's Theorem
Viviani's Window
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Side Splitting (Side-splitter) Theorem
Linear Transformations
horizontal hyperbola
MP2 - camile piaget
旁切圓、內切圓
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Quadratic Equations
Scalene Triangles
Cosine
Bar Chart or Bar Graph
Sphere