The circumference of a circle is the distance around its outer edge. We can find the circumference using the formula:

C = 2πr, where C represents the circumference and r is the radius of the circle. The value of π (pi) is approximately equal to 3.14 or can be rounded to 3.14159 for more precise calculations.

For example, let's say we have a circle with a radius of 5 units. Using the circumference formula, we can calculate:

C = 2 * 3.14 * 5 = 31.4 units.

Therefore, the circumference of the circle is 31.4 units.