#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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