Pentagonal Tiling around a Decagon
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Arrange ten regular pentagons in a circle around a column, attach a string of pentagons to each of the ten decagons, and then fill the space between the strings with additional pentagons.
Contributed by: Sándor Kabai (February 2008)
Open content licensed under CC BY-NC-SA
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"Pentagonal Tiling around a Decagon"
http://demonstrations.wolfram.com/PentagonalTilingAroundADecagon/
Wolfram Demonstrations Project
Published: February 7 2008