C = 2(pi)r 8cm=2(pi)r (8cm)/2pi = r d=2r d=8cm/pi
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The circumference of circle that is 8 cm is: about 25.13 cm (diameter x pi = 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.)
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.