Pi

Pi (π) is found by dividing the circumference by the diameter. ^C/_D = π. The first six digits of pi are 3.14159. Pi may be approximated to better than 0.1% by 22/7 (3.14286).

Pi can be defined by the integral

\pi=\frac{\sqrt{27}}{4}+24\int_{0}^{\tfrac{1}{4}}{\sqrt{x-{{x}^{2}}}dx}

We use pi in calculating circles.

Pi to 100,000 digits

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