The number pi is defined as the ratio of the circumference to the diameter of a circle; this gives it certain obvious uses if you are trying to calculate the circumference of a circle, or have other problems that involve measuring circles. However, it turns out that pi has innumerable other applications in mathematics, as well. Everything in mathematics is connected, and circles are very significant geometrical figures, which are related to many other types of problems and ideas.
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It's a Greek letter. Greek letters are often used to express constants (mathematical values that don't change).
Pi is approximately equal to 3.141592652389793238462.
It is a decimal
That's not a "mathematical principle", it is an approximation of the number pi.That's not a "mathematical principle", it is an approximation of the number pi.That's not a "mathematical principle", it is an approximation of the number pi.That's not a "mathematical principle", it is an approximation of the number pi.
Pi is a single number so there cannot be famous numbersof pi.