answers: Archimedes
context: reach 71 digits. In ancient China, values for included 3.1547 (around 1 AD), (100 AD, approximately 3.1623), and (3rd century, approximately 3.1556). Around 265 AD, the Wei Kingdom mathematician Liu Hui created a polygon-based iterative algorithm and used it with a 3,072-sided polygon to obtain a value of of 3.1416. Liu later invented a faster method of calculating and obtained a value of 3.14 with a 96-sided polygon, by taking advantage of the fact that the differences in area of successive polygons form a geometric series with a factor of 4. The Chinese mathematician Zu Chongzhi, around 480 AD, calculated </s> Distinguished Lecturer at the University of Tennessee, where he teaches courses in learning and thinking as well as cognitive psychology. Rajan Mahadevan Rajan Srinivasan Mahadevan is an Indian mnemonist. Mahadevan was born in Madras in 1957 and moved to Mangalore in 1959. He discovered his ability to memorize numbers at the age of 5 during a party hosted by his family. During the party, Rajan wandered to a parking lot and committed the license plate numbers of every guest's car for recitation later. In 1977, after losing interest in engineering, Mahadevan set to memorize substantial parts of pi. On 5 </s> and Babylonians. Around 250 BC the Greek mathematician Archimedes created an algorithm for calculating it. In the 5th century AD Chinese mathematics approximated to seven digits, while Indian mathematics made a five-digit approximation, both using geometrical techniques. The historically first exact formula for , based on infinite series, was not available until a millennium later, when in the 14th century the Madhava–Leibniz series was discovered in Indian mathematics. In the 20th and 21st centuries, mathematicians and computer scientists discovered new approaches that, when combined with increasing computational power, extended the decimal representation of to many trillions of digits after the
question: who did the first proof to find pi