The Chinese mathematician Zu Chongzhi, around 480 AD, calculated that π ≈ 355/113 (a fraction that goes by the name Milü in Chinese), using Liu Hui's algorithm applied to a 12,288-sided polygon. With a correct value for its seven first decimal digits, this value of 3.141592920... remained the most accurate approximation of π available for the next 800 years.
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Liu Hui
Liu Hui
Liu Hui of the Wei Kingdom around 265 AD.
If you mean "the value of pi rounded to the nearest hundredth," then: 3.14
The longest known value of pi is now into the hundreds of billions of digits.