π

Memorize: 1 3 5 => 113355

=> ∏ = 355/113


Note: Chinese mathematician Zhu Chongzhi (祖冲之 429–500 AD) computed ∏ up to 7 decimals, accuracy 1,000 yrs earlier than the West.

A diagram of a circle, with the width labeled as diameter, and the perimeter labeled as circumference

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