How can we use irrational numbers in math if we don’t know the full number?

Question

How can we use irrational numbers in math if we don’t know the full number?

In: 232

Answer 1

Computers can only compute to a fixed amount of digits. Humans have proven approximations that can produce these digits infinitely, so even if we don’t have a precise decimal representation, we can always reproduce it to the highest extent of our computational capabilities.