Pi

     To determine the area, you need to know the radius. In this case, the radius is 3 feet. To find the area, you use the equation area=Pi*radius^2. Since the radius is 3 feet, when you square it, you get 9 feet squared. The next step is to multiply 9 feet squared with Pi, you get 9Pi which is the area. To determine the circumference, you need to know the diameter or the radius. If you know the radius, double it to get the diameter. The equation to determine the circumference is circumference=diameter*Pi. Since the radius is 3 feet, the diameter is 6 feet. If you multiply the diameter with Pi, you get 6Pi. This is how you determine the area and circumference of a circle.

      Pi is found everywhere nature. When Pi was first discovered by ancient mathematicians, they were very fascinated. Pi has an infinite number of digits. There is no final digit for pi, and there is no pattern that has been discovered yet.