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Kaleidoscope with 3 mirrors
作者：
GeoGebra Institute of Hong Kong
Drag P to explore reflections in 3 mirrors forming an equilateral triangle.
GeoGebra
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Square Cross Sections
Exploring Number of Squares on the Diagonal of a Rectangle
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רישום חופשי
bewijs stelling van Pythagoras
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The Gamma Complex Number Line
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