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Penrose Stairway
Author:
Ivan De Winne
The Penrose stairs or Penrose steps, also dubbed the impossible staircase, is an impossible object created by Lionel Penrose and his son Roger Penrose.
GeoGebra
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Golden Rectangles and Golden Spirals
רישום חופשי
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探究長方形對角線上的正方形數目
power rule of x^n derivatives
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Cat on Ladder
Rastojanje izmedju dve tačke
Vector addition
Integral: Översumma och undersumma
arc 1
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Hypergeometric Distribution
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Cylinder