freeCodeCamp/guide/english/mathematics/pi/index.md

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PI

PI

PI = 𝜋 = 3.14159265359

PI is a mathematical constant whose value is approximately equal to 3.14159265359. It is defined as the ratio of circumference of a circle to its diameter. The PI is represented by a greek letter 𝜋 and is widely used in Physics and Mathematics.

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The ratio 𝜋 = circumference/diameter always remains the same, regardless of the size of a circle. For example, even if we take a new circle of twice the diameter of a previous circle, then the circumference of that new circle will be exactly double of the previous one preserving the value of 𝜋 to be constant.