formula_1 is often written as . It is also an irrational number, meaning it cannot be written as a fraction formula_8, where formula_9 and formula_10 are integers (whole numbers). This basically means that the digits of formula_1 that are to the right of the decimal go forever—without repeating in a pattern, and that it is impossible to write the exact value of formula_1 as a number. formula_1 can only be approximated, or measured to a value that is close enough for practical purposes.
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