Skip to Main Content

Copy of DIY Maths: Area of circles


In this module, you can study what the area of a circle is and how to find the area of a circle if you know its diameter or radius.


The video above shows you how to calculate the area of a circle if you know either the radius or the diameter.



The above video shows a visual explanation of the area formula. In other words, it shows you WHY the area of a circle equals pi times radius squared.

Did you know?

If a circle and a square have the same perimeter, their areas will be different.

Pi times r-squared means Pi x radius x radius.  It does NOT mean Pi x radius x 2.

Study and practice


Embed Calculator requires a newer version of Adobe Flash Player.

You must have the current version of the adobe flash player to use this online calculator.


Search Google

Use these search terms to find additional resources:

how to find the area of a circle
circle area

Google Web Search

Find help