DIY Maths: Area of circles

In this module, you can study what the area of a circle is and how to find the area of a circle if you know its diameter or radius.

If a circle and a square have the same perimeter, their areas will be different.

Pi times r-squared means Pi x radius x radius.  It does NOT mean Pi x radius x 2.

Study and practice

Use these search terms to find additional resources:

how to find the area of a circle
circle area