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pi

From Wiktionary

Οο $\longleftarrow$ 16 $\longrightarrow$ Ρρ

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TheSimple English Wikipedia has an article on:

Pi

Pronunciation

enPR:pī,IPA^(key):/paɪ/
SAMPA:/paI/
Audio (US) (file)
Audio (US) (file)
Homophone:pie

Noun

Lower case pi

Pi is equal to a circle's circumference divided by its diameter

Pi is aGreek letter written "π".
(mathematics)Pi is a number that is found bydividing thecircumference of acircle by itsdiameter. Pi isconstant, it is always the same (close to 3.14159 , alsoaccurate approx as ${\tfrac {355}{113}}$ , orrough approx as ${\tfrac {22}{7}}$ ). It is usually written as "π"
The distance around a circle is twice the radius timespi; C = 2πr.

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