The area of a circle is calculated using the following formula: $$ Area = \pi r^2 $$ Where \(r\) is the radius of the circle and \(\pi\) is the mathematical constant pi. The radius of a circle is the distance from the center of the circle to any point on the perimiter.
The formula explained: take the square of the radius and multiply it by \(\pi\). If you are not familiar with the \(\pi\) (pi) symbol, please visit this page: What is Pi?
Enter the radius of a circle below to see its area.