The mathematician who first found or calculated an accurate estimate of pi is Archimedes. He lived around 287–212 BC and was a Greek mathematician from Syracuse. Archimedes created the first algorithm to approximate pi by inscribing and circumscribing polygons around a circle, starting with hexagons and increasing the number of sides up to a 96-sided polygon. Using this method, he was able to approximate pi as about 3.14, giving the first few decimal points of pi
. In the context of the 7 Little Words puzzle game, the answer to the clue "Mathematician who found pi" is also ARCHIMEDES, which fits the 10-letter requirement of the puzzle
. Thus, the concise answer is: Archimedes
