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π is commonly defined as the ratio of a circle's circumference C to its diameter d.

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It is given by

π=C/d

- The ratio C/d is constant, regardless of the circle's size. For example, if a circle has thrice the diameter of another circle it will also have thrice the circumference. So, it will preserve the ratio C/d.
- π is an irrational number, meaning that it cannot be written as the ratio of two integers.
- Fractions such as 22/7 and 355/113 are commonly used to approximate π, but 22/7 and 355/113 are not the exact value of π.
- Because π is irrational, it has an infinite number of digits in its decimal representation, and it does not settle into an infinitely repeating pattern of digits.
- π is a transcendental number, which means that it is not the solution of any non-constant polynomial equation with rational coefficients.

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