Sliding Tiles
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Slide a triangular pattern of tiles around the inside of a square. How many times do you need to go around to bring the pattern back to its original position? (It is not four!)
Contributed by: George Beck (March 2011)
Open content licensed under CC BY-NC-SA
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"Sliding Tiles"
http://demonstrations.wolfram.com/SlidingTiles/
Wolfram Demonstrations Project
Published: March 7 2011