The Crazy Circle Illusion: How are these dots moving? GeoGeb

[color=#c51414][b]Inspired by[/b][/color] [url]http://sploid.gizmodo.com/all-the-white-dots-in-this-rotating-circle-are-moving-i-1608517148[/url]. [b][color=#c51414]For more details watch[/color] [/b][url]https://www.youtube.com/watch?v=pNe6fsaCVtI[/url][b][/b] [b][color=#1551b5]GeoGebra week challenge[/color][/b]

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Comments (2)

  • The individual white circles are moving in straight lines bisecting (actually diameters of) the larger red circle, correographed sequentially at equidistant arcs.
  • Actually, this is a nice way to illustrate the so-called [b]Tusi couple[/b] - a theorem first described by the medieval arab scholar Nasr al-Din Tusi around 1247 - see Wikipedia: [url]http://en.wikipedia.org/wiki/Tusi_couple[/url]
 
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