Sometime around 1550 BC an Egyptian scribe named Ahmes noted down a method for obtaining the area of a circle, in what is the earliest recorded attempt to evaluate the number we know as 𝜋.

The history of 𝜋 (its symbol is the Greek letter pi) is fascinating, as are its many applications in poetry. To 16 digits, the expansion of 𝜋 is

𝜋 = 3.141592653589793.

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