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and jade discs called Bi.

The Egyptian Rhind papyrus, dated to 1700 BCE, gives a method to find the area of a circle. The result corresponds to (3.16049...) as an approximate value of {{pi}}.

Book 3 of Euclid's ''Elements'' deals with the properties of circles. Euclid's definition of a circle is:

In Plato's Seventh Letter

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