There is no such thing as "the diameter of the circumference" of a circle.
A circle has a diameter, and a circle has a circumference. If you know one, you can
always figure out the other one, because they're very tightly connected.
Circumference = (diameter) times (pi)
Diameter = (circumference) divided by (pi)
"pi" = about 3.1415926536 (rounded). You can use 3.14 and your answers will be very close.
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