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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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Graphing a Circle in Polar Coordinates
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Sine in Cartesian and Polar Coordinates
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גיליון אלקטרוני להעלאת נתוני בעיה ויצירת גרף בהתאם
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Bonsai Plant
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hex用(点なしバージョン)2.01
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