Rational numbers are defined as numbers that can be written as the ratio of two whole numbers. Some numbers cannot be written like that. These are irrationals. We need to define an irrational number with something different. Like an infinite sum that adds up to a certain value or a square root. We call them irrational because they are not rational, the name itself holds no more information. How do we assign rational values to numbers like pi? Its an approximation, any number can be approximated with a rational.
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