#circumference  the length of the closed curve of a circle
  exclusion:  width  height  length  diameter  surface_area  volume  thickness  tenuity  angle
  supertype:  spatial_characteristic (menu)  length.distance
  part:  sextant.angular_unit  a unit of angular distance equal to 60 degrees
     part:  arcdegree__degree  a measure for arcs and angles; "there are 360 degrees in a circle"
        part:  minute_of_arc__minute__arcminute  a unit of angular distance equal to a 60th of a degree
           part:  arcsecond__second  a 60th part of a minute of arc; "the treasure is 2 minutes and 45 seconds south of here"
  part:  straight_angle  an angle of 180 degrees
     part:  quadrant.angular_unit__right_angle__rightangle  a quarter of the circumference of a circle
        part:  grad__grade  one-hundredth of a right angle
        part:  oxtant  a unit of angular distance equal to half a quadrant
           part:  arcdegree__degree  a measure for arcs and angles; "there are 360 degrees in a circle"

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