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0.000095meters = 0.095mm Dia of Hair = 0.095 + 10 = 10.095mm Diameter = 10.095mm
pi was not made - it is not a human artefact. The ratio of the circumference of a circle to its diameter exists independent of human existence.
You do a diameter circle!!
Nerves are pretty small. Consider that the human spinal cord, with its many, many nerve pathways, is under 10 mm in diameter at it widest point. Individual nerves have diameters ranging from perhaps 4 to 100 micrometers, depending on the location.
It is half of the diameter or radius = diameter/2