ANSWERS: 2
  • Pi/2 is also used. It doesn't really matter much. The current value produces the magic equation e^(i*pi) + 1 = 0 which would be less elegant if pi were doubled.
  • You cannot easily measure the radius of a pipeline in the middle of the desert, but you can measure its diameter. If you don't know where the center is, or you cannot access it, it might be easier to measure the diameter, using a caliper or a micrometer. http://en.wikipedia.org/wiki/Caliper http://en.wikipedia.org/wiki/Micrometer I guess that for this reason, some professions traditionally used more the diameters than the radius.

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