By definition, pi is the ratio of the circumference of a circle to its diameter. Pi is always the same number, no matter which circle you use to compute it.
Pi is a very old number. We know that the Egyptians and the Babylonians knew about the existence of the constant ratio pi, although they didn't know its value nearly as well as we do today. They had figured out that it was a little bigger than 3.
Pi was chosen as the letter to represent the number 3.141592... because the letter pi in Greek, pronounced like our letter 'p', stands for 'perimeter'.
If you write pi down in decimal form, the numbers to the right of the decimal point never repeat in a pattern. Although many mathematicians have tried to find it, no repeating pattern for pi has been discovered.
The latitude for the cache is the sequence of 7 numbers at 787,547 into pi. The longitude is the 7 digit sequence at 8,583,531 into pi. Count from the first digit after the decimal point. The 3. is not counted. Cache is an ammo box. FTF Button and a Rolex watch!