Area of a Circle - Geometry for Kids - What is the area of a circle? How do we know the area if we only have the radius or the circumference of a circle?

Area of a Circle

Radius

The area of a circle is the flat surface inside its circumference. The area is always equal to the radius squared, multiplied by π (pi).

Click here to see a proof that this is always true for any circle.

Radius
Diameter
Circumference of a Circle
Main Geometry page

To find out more about circles, check out these books from Amazon.com or from your library:

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