#radius__r  the length of a line segment between the center and circumference of a circle or sphere
  supertype:  #length.distance  the linear extent in space from one end to the other; the longest horizontal dimension of something that is fixed in place; "the length of the table was 5 feet"
  subtype:  #semidiameter  #radius_of_curvature
  part of:  #diameter__diam  the length of a straight line passing through the center of a circle and connecting two points on the circumference

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