Pi is used to find the area and perimeter of a circle and the volume of a sphere, cylinder, and cone. Pi=3.14159265358979323846264338327950288419716939937510582097494459230781640628620899862803482534211706798214808651328230664709384460955058223172535940812848111745028410270193852110555964462294895493038196... That was 200 decimal places of Pi.
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Pi is important to the study of math because is can be used in many ways. For example, you can use it to find the circumference of a circle and the volume of a sphere. I am not really sure how people calculated that pi works for that, but it plays a big part in our math history.
Pi can be used to find a circle, For the circumference-Pi x D, or for the radius Pi x r2
Pi is usually used as 3.14 in math because it originally goes on to infinity. Therefore, using two significant digits (the most popular used significant digit out there), Pi is abreviated to 3.14. The original Pi goes on forever, but is something like this: 3.147938401643257580923756348170125346938463728395647399047683 583057202350254183503827502854030284820472927492947291248...
The number for pi is: 3.1415926535897932384626433832795
Pi (3.141...) is used for circles, and circles only. You use it to find the area and circumfrence.