circumference = diameter x pi (pi = 3.14159265 or 3.14 for rough approximation)
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If you know the diameter and need the circumference you times the diameter of the circle by 3.14 also known as pie. That is how you get the circumference by only knowing the diameter. :)
to find the diameter of a circle when you only have the circomference you: divide the circomference by pi (approx. 3.14)
If you only have a given diameter you have to multiply the diameter by Pi (3.142) or 3.14 and then you get the circumference!
circumference = pi x diameter; diameter = circumference/pi = 8/pipi is approximately 3.14You do the math if you want an approximation(There is no rational answer to this question, only approximations.)
If you know the radius, then Diameter = 2 x (radius) Circumference = (pi) x (diameter) or Circumference = 2 x (pi) x (radius)