First you times 3.14 by the diameter and there you go
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If you do the actual multiplications, you will find out soon.
The answers depend on what you want to "do" and what information you have.
They are its circumferences
If you are given the radius (r) or diameter (d, which is twice the length of the radius) the equation to find the circumference (C) is: C=d(pi) or C=2r(pi).
Multiply each of the diameters by pi (pi = 3.14159265 or 3.14 for rough approximation) to find the circumferences of the circles.