Circle 3.0

Prehistoric people made stone circles and timber circles, and circular elements are common in petroglyphs and cave paintings.^[2] Disc-shaped prehistoric artifacts include the Nebra sky disc 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 ⁠256/81⁠ (3.16049...) as an approximate value of π.^[3]