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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

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Use these search terms to find additional resources:

how to find the area of a circle
circle area

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