well i thought PI was a mathematical constant, and that it is still trying to be figured to it's correct decimal value, but now instead of mathematicians and philosophers doing it, we have computers (it's gone from having 35 decimal places to over 100,000,000).

It is the expressed ratio between the circumference of a circle and it's diameter, from what I remember from maths... and you would simply just use PI (as we currently know it 3.1416). So technically, i guess i'm trying to say, you can't figure PI, or if you do, you'll be spending an awful long time on it (someone spent their whole lives!), but you can

*use *PI to figure things.

I probably haven't helped you out much at all!

EDIT: to be clearer for you. PI will always be the same no matter what size circle you are using... you divide the circumference of a circle by it's diameter, and you will get PI, but as this is always the same, this is why i said to use 3.1416 - here are some more complex formulas for pi:

**Vieta's Formula **
2/PI = 2/2 * ( 2 + 2 )/2 * (2 + ( ( 2 + 2) ) )/2 * ...c

**Leibnitz's Formula **
PI/4 = 1/1 - 1/3 + 1/5 - 1/7 + ...

**Wallis Product **
PI/2 = 2/1 * 2/3 * 4/3 * 4/5 * 6/5 * 6/7 * ...

2/PI = (1 - 1/22)(1 - 1/42)(1 - 1/62)...

**Lord Brouncker's Formula **
4/PI = 1 + 1

----------------

2 + 32

------------

2 + 52

---------

2 + 72 ...

(PI2)/8 = 1/12 + 1/32 + 1/52 + ...

(PI2)/24 = 1/22 + 1/42 + 1/62 + ...

**Euler's Formula **
(PI2)/6 = (n = 1..) 1/n2 = 1/12 + 1/22 + 1/32 + ...

(or more generally...)

(n = 1..) 1/n(2k) = (-1)(k-1) PI(2k) 2(2k) B(2k) / ( 2(2k)!)

B(k) = the k th Bernoulli number. eg. B0=1 B1=-1/2 B2=1/6 B4=-1/30 B6=1/42 B8=-1/30 B10=5/66. Further Bernoulli numbers are defined as (n 0)B0 + (n 1)B1 + (n 2)B2 + ... + (n (n-1))B(N-1) = 0 assuming all odd Bernoulli #'s > 1 are = 0. (n k) = binomial coefficient = n!/(k!(n-k)!)

I think this may be a little too detailed for you tho

You may have to actually get an EZ book for her PI calculations, I couldn't find much online about using her technique (prolly cause the content is copyrighted)