#circularity__disk_shape  the roundness of a 2-dimensional figure
  supertype:  #roundness__roundnes  the property possessed by a line or surface that is curved and not angular
  subtype:  #concentricity  the quality of having the same center (as circles inside one another)
  subtype:  #eccentricity.circularity  a circularity that has a different center or deviates from a circular path

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