# define pipi =3.142

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Pi is the ratio of the circumference of a circle to its diameter.

For example if the circumferece was 22 and the diameter 7, pi would be calculated by 22/7.

It was observed by the ancient Greek mathematecians that this number would always be 3.14, thus you can call it a constant.

The number is also in irrational number. The numbers right of the decimal go on indefinitely and do not repeat themselves.

Pi is the ratio of the circumference of a circle to its diameter.

For example if the circumference was 22 and the diameter 7, pi would be calculated by 22/7.

It was observed by the ancient Greek mathematecians that this number would always be 3.14, thus you can call it a constant.

The number is also in irrational number. The numbers right of the decimal go on indefinitely and do not repeat themselves.

`pi` does not exactly equal 3.14. Most mathematicians cringe when people say that it does. The definition for pi is that it represents the ratio of the circumference of a circle to its diameter. Another way to say the definition is that pi is the circumference of a circle divided by its diameter, `pi=C/d` . The true decimal value of pi will never be known since the decimals do not terminate or have a repeating pattern. It is an irrational number and cannot be expressed as a fraction where the numerator and denominator are integers. When needing the value of pi to calculate a value, the best approximation is to use the pi button on a calculator.