Pi (nonfiction)
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![](/w/images/thumb/3/30/Pi_equals_C_over_d.svg/300px-Pi_equals_C_over_d.svg.png)
The circumference of a circle is slightly more than three times as long as its diameter. The exact ratio is called π.
The number pi is a mathematical constant, the ratio of a circle's circumference to its diameter, commonly approximated as 3.14159.
Fiction cross-reference
Nonfiction cross-reference
External links
- [ Pi] @ Wikipedia