Diameter: nm (word coming from the Latin diametrus, from the Greek diametros).
The word “diameter” has several meanings:
1. Straight line passing through the center (of a circle, of a sphere).
Ratio of circumference to diameter (pi).
Half diameter (radius).
The diameter of the Earth, measured at the poles, is 12 kilometers.
Geometry: Diameter of a curve: the rectilinear locus of the midpoints of the chords parallel to a given direction.
2. The greatest width or thickness (of an object...
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