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The circumference of a circle can be calculated using the formula C = πd, where C is the circumference, π is a constant approximately equal to 3.14159, and d is the diameter of the circle. Given a diameter of 65 cm, the circumference would be C = π(65) = 65π cm, which is approximately 204.203 cm.
Assuming you are talking about a circle, you simply multiply the diameter by pi. Keep the result (in this case) as 65pi to have it exact, or use an approximation of pi such as 3.1416, and do the multiplication, if you want an actual number.
Circumference of the circle: 65*pi = 204.204 cm rounded to 3 decimal places
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