Pi, or 3.14159... Using the equation Circumference = pi * diameter.
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pi or 3.14159265...
It is: circumference/diameter = pi
Diameters don't have "circumference." If you want the circumference of a circle with diameter 18 in, then it is just pi*d = 18pi inches.
You can do an experiment on several circles of different diameters.
Infinitely many. Each point on the circumference of a semicircle can be one end of a diameter and there are infinitely many points in a line segment of any length.