circumference = pi x diameter; diameter = circumference/pi = 8/pi
pi is approximately 3.14
You do the math if you want an approximation
(There is no rational answer to this question, only approximations.)
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The circumference of circle that is 8 cm is: about 25.13 cm (diameter x pi = circumference).
The diameter of a circle that has a 33 cm circumference is: 10.5 cm (circumference divided by pi = diameter).
The diameter is 23.99 cm (circumference divided by Pi = diameter).
If that's the diameter, you can multiply that by pi (which is approximately 3.14), to get the circumference.
If the circumference is 20 cm then the diameter is 6.366 cm