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| accessdate = 2012-02-12}}</ref> went further in 1882 and proved that '''π''' is a [[transcendental number]] which means it can't be expressed as the solution to any simple equation).

| accessdate = 2012-02-12}}</ref> went further in 1882 and proved that '''π''' is a [[transcendental number]] which means it can't be expressed as the solution to any simple equation).

The approximate value quoted above is accurate enough to calculate the circumference of a circle of the size of the Earth with an error of only about 1 millimetre. For rough approximations, the fraction 22/7 (= 3.142857...), correct to 2 decimal places, is sometimes used.  A more accurate fractional approximation is 355 / 113 (= 3.14159292), which is correct to 6 decimal places.

The approximate value quoted above is accurate enough to calculate the circumference of a circle of the size of the Earth with an error of only about 1 millimetre. For rough approximations, the fraction 22/7 (= 3.142857...), correct to 2 decimal places, is sometimes used.  A more accurate fractional approximation is 355 / 113 (= 3.14159292...), which is correct to 6 decimal places.

==History==

==History==