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Almost every mathematical culture through history seems to have proved, trusted, or suspected that the area of a circle is a fixed constant times the square of its radius. It is maybe not surprising, then, that the last two millennia have seen a seemingly endless array of attempts to calculate this constant (today usually called π" role="presentation">π) with increasing precision.
Dominic Klyve (Central Washington University), "How to Calculate π: Machin's Inverse Tangents, A Mini-Primary Source Project for Calculus II Students," Convergence (August 2018)
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