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How to work out a circle's area

Updated on June 18, 2012

What is the circle's area?

The area of a circle is the measurement of all the space within the circle's limits. For the easiest way of calculating the circle's area, you'll need to know the circle's radius.

What is the radius of a circle?

Working out the area from the radius

The mathematical formula is as follows:


If that means nothing to you however, here is the explanation:

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:

  1. Multiply the value of the radius by itself (so if the radius is 5, it would be 5x5)
  2. Multiply the result by Pi
  3. The resulting number is the circle's area

Test the formula

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