Visual Encyclopedia

Pi

The number ' (/ˈp/) is a mathematical constant. Originally defined as the ratio of a circle's circumference to its diameter, it now has various equivalent definitions and appears in many formulas in all areas of mathematics and physics. It is approximately equal to 3.14159. It has been represented by the Greek letter "" since the mid-18th century, though it is also sometimes spelled out as "pi'".

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Proof of Pi = 4 by Vi Heart. A response to a proof going around that claims Pi is not 3.14. Once again Vi Heart asks viewers to test mathematical concepts instead of immediately taking them as fact.

Contributed by Kandi Smith

Pi: Is it over complicated?

Contributed by Laura Renae Judy

Pi pie

Contributed by Cassie Leyba

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