**Circumference **is the distance around the edge of a circle. It is the **perimeter **of a circle. Example: The **circumference **of a circle with a radius of 5 cm is 31.4 cm.

This can be calculated using the formula **C = 2Ï€r**, where r is the **radius**. Therefore, C = 2Ï€5 = 31.4 cm.