pi
word
/ˈpaɪ/
py
/pˈaɪ/
py
Definition
Pi is a mathematical constant, the ratio of a circle’s circumference to its diameter, approximately equal to 3.14159. It is often symbolized as π and used in geometry and calculations involving circles.
Usage & Nuances
'Pi' is a technical term used mainly in math and science. Always written as the Greek letter π in formulas. Not related to 'pie' (the dessert), which is a frequent learner mistake. Common phrases include 'pi day' (March 14).
Spanish: piPortuguese (BR): piPortuguese (PT): piChinese (Simplified): 圆周率Chinese (Traditional): 圓周率Hindi: पाईArabic: بايBengali: পাইRussian: пиJapanese: パイVietnamese: piKorean: 파이Turkish: piUrdu: پائیIndonesian: pi
Example Sentences
The symbol for pi is π.
basic
Even supercomputers keep trying to find more digits of pi.
natural
The value of pi is about 3.14.
basic
We use pi to find the area of a circle.
basic
On Pi Day, math lovers celebrate pi with fun activities.
natural
You can’t calculate the circumference of a circle without pi.
natural