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# How to work out a circle's circumference: Easy Formula

## What is the a circle's circumference?

The circumference of a circle is the measurement of the circle's perimeter - or in other words, the actual line you draw to make the circle. To work out the circumference, you will need to know the radius of the circle.

## Working out the circumference from the radius

The formula looks something a little like this:

**2(pi)R**

Now understandably, that may not mean anything to you... so, here it is in more simple terms:

Pi is the magic number used to help work out any circle's area. It is a never ending number, but for the purpose of this exercise we will take it to be of value: **3.142.**

So the formula above actually means the following:

**Multiply Pi by 2****Multiply the result by the radius****The resulting number is the circle's circumference**

## Test This Formula

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