Translation guide
The mathematical constant π (approximately 3.14159). In Japanese, it is almost always referred to by its Greek letter name or the mathematical term.
Referring to the number pi in mathematics, science, or everyday contexts.
The most common way to say 'pi' in Japanese, borrowed from English. Used in schools, casual conversation, and most non-technical contexts.
The ratio of a circle's circumference to its diameter is represented by pi.
The formal mathematical term meaning 'ratio of circumference'. Used in textbooks, academic papers, and formal settings. Literally 'circle circumference ratio'.
The Greek letter π is used in mathematical writing, pronounced as パイ. Common in formulas and technical documents.
π = 3.14159...
Pi is approximately 3.14.
Pi is an irrational number.