It means it is not an algebraic number. Algebraic numbers include square roots, cubic roots, etc., but more generally, algebraic numbers are solutions of polynomial equations.
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That's pi, the sixteenth letter of the Greek alphabet. In mathematics, it is defined as the numerical value of the ratio of the circumference of a circle to its diameter.
Two of the most important numbers in advanced mathematics are pi and e and both are irrational.
Nobody has yet discovered the true value of pi in mathematics because it is an irrational number and its value is the circumference of any circle divided by its diameter is equal to pi which is impossible to work out.
Archimedes' achievements in mathematics are some of the greatest ever made in the field, and include being the first person to mathematically calculate pi. He is considered to be the Father of Mathematics for this reason.
I am 10 year old and pi is used to find the circuference of a circle. It is used because it is the ratio of the circuference to its diameter more specificly Pi is a rule in mathematics enjoy learning!!