Very! It allows you to do all sorts of calculations involving curves and circles that would otherwise prove incredibly difficult.
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Two of the most important numbers in advanced mathematics are pi and e and both are irrational.
Two of the most important numbers in mathematics, pi and e (Euler's number) are both transcendental. Both are used in almost all branches of mathematics, and through that, in our daily lives even if you are not aware of them.
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.
The history of pi dates back to ancient civilizations, such as the Babylonians and Egyptians, who approximated the value of pi. The first accurate calculation of pi was made by the Greek mathematician Archimedes in the 3rd century BC. The symbol for pi was introduced by the Welsh mathematician William Jones in the 18th century, and it has since become one of the most important mathematical constants in mathematics.
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.