Can you remember how to calculate the area and circumference of a circle?

It is important to know how to do this for any GCSE maths paper. There are two very useful formula but they can be a little confusing to remember. To help you, I have a fun ditty that my maths teacher taught me when I was at school (many moons ago!).

## Tweedle Dum and Tweedle Dee

Round the circle is Pi times d

If the area is to be declared

Use the formula Pi r squared

Of course, you’ve got to understand what the d and the r represent. Pi is represented as the **π **symbol. It can either be simplified to something like 3.14 or you can use the **π** button on your calculator.

Here’s a handy diagram, recapping the component parts of a circle:

So in summary, these are the two formula you’d need to know for a GCSE maths exam.

## Circumference of a Circle = πd

## Area of a Circle = πr^{2}

All of this can be found on a handy, FREE to download, PDF file that I have created – How to calculate the area and circumference of a circle.