Technically pi is two letters put together to form a word. How ever, the word "pi" does represent the number 3.14159265... (or simply 3.14).
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no every periodic number is rational but pi is irrational
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Pi is an irrational number; it can't be represented as a fraction of two integers. It has been proved that the majority of real numbers are irrational. The proof that pi is irrational was found in 1770; it's slightly too complicated to put in this answer, but if you search with google for pi irrational proof then you will find several different proofs.
Pi is the ratio of the diameter of a circle to the circumference. It is used in various formulas, such as the area of a circle and the volume of a cone. It was discovered by the ancient Greek mathematicians. We are finding more and more digits of pi as technology advances, but we will never reach the end because pi is an irrational number.
Well, darling, the absolute value of pi is simply pi itself. You see, the absolute value of a number is its distance from zero on the number line, and since pi is already positive, its absolute value remains pi. So, no need to overcomplicate things here, sweetie.