As a domain expert in mathematics, I'd like to clarify some common misconceptions about the number π (pi).
Pi is a mathematical constant that represents the ratio of a circle's circumference to its diameter in Euclidean space. It is an irrational number, which means it cannot be expressed as a simple fraction of two integers. This property leads to its most distinctive feature: π has an infinite, non-repeating decimal expansion.

The statement that "The number pi is finite" is not accurate.
Pi is indeed an infinite number in the sense that its decimal representation goes on forever without repeating a pattern. However, it is also a constant, meaning its value does not change and it is the same for all circles, regardless of their size.

The fraction 22/7 is a common approximation of π, but it is not its exact value. While it is close to the actual value of π (which is approximately 3.14159), it is important to note that 22/7 is a rational number because it can be expressed as a ratio of two integers, and it is finite in its decimal expansion (repeating the pattern '.142857').

An irrational number, by definition, is a number that cannot be expressed as a ratio of two integers. When irrational numbers are expressed as decimals, they have an infinite, non-repeating decimal expansion. This is the case with π. Its decimal expansion has no repeating pattern, and it goes on indefinitely.

To illustrate the concept further, let's consider the decimal expansion of π to a few places:

> 3.141592653589793...

As you can see, there is no repeating pattern, and if we were to continue, the digits would continue to be non-repeating and non-terminating.

In practical applications, π is often rounded to a certain number of decimal places. For example, for many engineering calculations, π is approximated to 3.14. In more precise calculations, more decimal places are used, such as 3.14159 or even more, depending on the required accuracy.

In conclusion, π is an infinite number in terms of its decimal expansion, but it is a finite constant in the sense that it has a specific, unchanging value. The approximation 22/7 is useful for quick estimates but does not capture the true nature of π as an irrational number.

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The number pi is finite. Its has a constant value of 22/7. The part of pi which is actually infinite is its decimal part. [ An irrational number is a number, which is not exactly expressible as a ratio of two integers, and having an infinite(non-recurring) expansion when expressed as a decimal.]read more >>