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→Algorithm: It's not immediately obvious where so many digits come from since the following line says number of correct digits doubles with each step. |
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Line 24:
:<math>\pi \approx \frac{(a_n+b_n)^2}{4t_n}.\!</math>
The first three iterations give (approximations given up to and including the first incorrect digit):
:<math>3.140\dots\!</math>
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