When using Pi, you can find both the area and circumference of a circle. When you find the area of the circle, you have to use a formula. That formula is area equals Pi times radius square. That is all you do to fine the area of a circle. For example let's say your radius is 3 then you would have to do 3.14 and multiply that by 3 squared and then you will have your answer which will then be your area of that circle.
     To find the circumference all you do is use a formula as well. You have to do diameter times Pi and then you will find the circumference of a circle.  

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