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How many digits do we know in pi?
Pi was not calculated to more than seven digits ? using geometric techniques. The first exact formula for pi, based on infinite series, wasn't available until the Madhava-Leibniz series was discovered in Indian mathematics in the 14th Century. Since then, computer scientists have discovered new approaches, and as of late 2013, had calculated pi up to more than a trillion digits.
The picture above show pi to 800 decimal places.