To find circumference you must multiply twice the radius by π, or using the diameter, if it gives it to you, multiply that by π.
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circumference = diameter x pi (pi = 3.14159265 or 3.14 for rough approximation)
You must use the information that you do have about that cicle, along with theequations and formulas you've learned that give the relationship between thekind of information you have and the radius of cicles in general.
Pi X D = Circumference. To find Diamater if you know Circumference, divide Circumference by Pi (3.14).
Circumference = Pi * diameter
The circumference is: 32.1