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The value pi is a constant, but is called an irrational number as an exact value for pi does not exist. In non-calculator working out, approximate values are used, of which 3.14 and 3.142 are probably the most common. Other, less accurate approximations are frac{22}{7} and 3.
All scientific calculators have a pi button. You can use this to make your calculations more accurate.
The earliest known use of the Greek letter pi, to represent the ratio of a circle's circumference to its diameter, was by the Welsh mathematician William Jones in his 1706 work ‘Synopsis Palmariorum Matheseos’ or, ‘A New Introduction to the Mathematics’.
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