Final answer:
The formula to calculate the circumference of a circle is C = 2πr, where C represents the circumference, π represents pi (approximately 3.14159), and r represents the radius of the circle.
Step-by-step explanation:
The formula to calculate the circumference of a circle is:
C = 2πr
In this formula, C represents the circumference, π represents the mathematical constant pi (approximately 3.14159), and r represents the radius of the circle.
For example, if the radius of a circle is 5 units, the circumference can be calculated as:
C = 2π(5) = 10π units