Pi

Pi is a number you use to find the area and circumference of a circle.

Pi measures 3.14 in use of circumference and area of a circle.

  The formula for the area is . r = radius.

  The diameter is all the way across.

  The radius is half the diameter.

  So, you have this problem, Find the area, so say they give you the diameter which is 4.

  So, half the diameter is the radius.

 So, the radius is 2.

 So, your problem is 3.14 x 2 2.

So, your answer in this case is 6.28 2.

The formula for the circumference is  . 

So, say you have the problem, Find the circumference.


They give you the diameter which is 8.


So, you know your radius is 4. 


Your problem is 2 x 3.14 x 4.


So, your answer is 25.12




Pi Practice