Fractional representations of Irrational Numbers won't be accurate. Many people have used 355/113 as a close approximation.
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Since pi is an irrational number it is impossible to represent the exact quantity as a decimal; you can only give and approximate value. However, if you write a fraction that includes the symbol for pi, you are giving an exact quantity.
Since pi is irrational, there is (by definition) no way to express it as an exact fraction. Even so, many people write it as 22/7, which is a fairly accurate representation. But it is not exact!
The equivalency of Pi in a fraction is 22/7.
pi is an irrational number and so there is no equivalent fraction.
22/7 is the globally accepted fraction for the decimal number Pi.