The circumference is the measurement of a circle. There are different reasons why you may need to calculate the circumference of a circle in real life. If you wanted to know the area of a pizza besides knowing that it is small, medium or large, also, the pizza might say that it is nine inches. However, this measures the inches around the pizza and not the whole amount of inches on the inside of the pizza.

Therefore, you will need to know the circumference of it. To do that, you will need to know the diameter or radius of the circle. Then use the formula C = 2 (3.14) (r). Therefore if you plug in the numbers, you would get 314 inches.