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 – DOWNLOAD – How to calculate the area and circumference of a circle.

## Like this? Read more below…

## About Me

My name is Nicola Bhalerao and I am a private tutor based in Warwick. Since 2013, I have provided one-to-one tuition for children and adults. I specialise in maths tutoring, but cater for different requests, ranging from 11+ to various computing skills, including website training.

My background is in computing, with a Computer Science degree from Warwick University. I have worked many years as a programmer, latterly in the games industry. Both my sons were tutored by me for the 11+ (they went to a local grammar school). I received training for teaching secondary school maths and I am fully CRB checked.

I am a WordPress expert, having spent many years creating numerous websites with my other business, Smiling Panda Web Design. Although I no longer actively work on websites for others, I offer help with understanding / updating / creating your own WordPress website.

Read here for more information on **tuition for your child** or **tuition for yourself or another adult**.