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