Dictionary: Pi (π)

Pi (π) is the ratio between the circumference and diameter of a circle — one of the most famous constants in mathematics.

📅 30. April 2026 👁️ 73 views 📂 ordbok 🇳🇴 Les på norsk

π = circumference / diameter ≈ 3.14159265...

π is an irrational number — it cannot be written as a fraction and the decimals continue infinitely without pattern.

Circumference: C = 2πr
Circle area: A = πr²
Sphere surface: A = 4πr²

Archimedes will be remembered when Aeschylus is forgotten, because languages die and mathematical ideas do not.

— G.H. Hardy (1877–1947)

Read also