#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"
  part of:  diameter
  subtype:  semidiameter  the apparent radius of a celestial body when viewed as a disc from the earth
  subtype:  radius_of_curvature  the radius of the circle of curvature; the absolute value of the reciprocal of the curvature of a curve at a given point

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