Geometry Help
 

Area of a Circle

Today we are going to calculate the area of a circle. Calculating the area of a circle is easy and we will show you the formula for area of a circle.

First let us define some terms that will be needed to calculate the area of a circle.

Area of a circle

In any circle, there is a radius which is the distance between the mid point of the circle to the perimeter or circumference of the circle. The radius of a circle is usually labelled 'r'.

When calculating the area of a circle, you will also need to know about a mathematical entity called 'pi' which is given by the symbol shown.

pi

Pi is approximately Pi approximation

Formula for area of a circle

The formula to find area of a circle is:

Formula for area of a circle

That's it! To calculate the area of a circle, all you need is to measure its radius and plug the number into the equation. And there you have it!