#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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