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How to Calculate the Area of a Circle

A circle is a shape formed by a single curved line and every point in that line is the same distance from the center of the circle.

To calculate the area of a circle, we need to know the length of the radius. The radius is the length from the center point of the circle to the outer edge or circumference of the circle. Like the one shown here. The radius of this circle is 1.4 centimeters. The formula for calculating the area of a circle uses a Greek symbol called pi. The symbol looks like this. Pi is sometimes given the value 22 over 7 which is approximately 3.14. For a more accurate approximation, you should have a pi button on your calculator.

The formula for area equals pi times the radius squared, R stands for the radius measurement of the circle. So the formula is area equals pi R squared.

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