Although there are measurement techniques that do appropriate pi, that’s done mostly because it’s interesting. Typically one calculate pi. The calculation cant ever be completed but the more you don’t the better your approximation. en.m.wikipedia.org/wiki/Leibniz_formula_for_π

That sort of stuff is done a lot. However, you don’t need all that many digits before adding more digits doesn’t meaningfully affect calculations. jpl.nasa.gov/…/how-many-decimals-of-pi-do-we-real…