"The Egyptians didn't have a ball point pen handy so they created the Pyramid to calculate pi with."
So they spent 20 or thirty years building it? Don't you think that they could have devised a simpler means?
Actually all of this nonsense about the ratio of the height of the pyramid to the perimeter of the base being twice pi is easily dispensed with by anyone with the least familiarity with the classics. And I am amazed that you, given the intimate knowledge of classical Greek that you have claimed on another thread, would not be aware of this.
Get out your Herodotus (in the original Greek, the relevent passage is consistently mistranslated into English). Look at Book II, #124, in which Herodotus gives the dimensions of Cheops' pyramid and the design principles that led to the relations between its dimensions. He says that he was told that the dimensions were chosen so that the area of a triangular face of the pyramid would be equal to the square of the height of the pyramid. With a little elementary geometry and algebra you easily find that this yields the ratio that is found of the height to the perimeter of the base, i.e., about 6.28. That that number coincides with twice pi is pure coincidence.