Mathematics: 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.

Pi is the name for a very long number:   3.1415926535897932384626433832795028841971...

The symbol for pi is:  π

A scientific calculator has a button 'π' to press if you need to use pi.

Formula for area of a circle:  

This means pi x radius x radius.  (It does NOT mean pi x radius x 2)

Study and practice