Pi Pie pie pye

3.14159265358979323846264

In elementary school when I first learned about pi to calculate the circumference or area of a circle I generally stuck with 3.14.

Later on, I always used 3.14159. I felt that five decimal places was sufficient for the amount of accuracy that I would ever need.

Knowing pi to the twenty-third decimal places seems to me to be excessive and not particularly useful.