What is circumference of a circle with a diameter of 65 cm?

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.