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The circle formulas
d = diameter circumference = πd C = πd A = πr² r = d/2
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Archimedes: trapping pi between polygons (~250 BCE)
inscribed perimeter = 6r circumscribed perimeter = 6r×2/√3 BOUNDS 3.000 inscribed (n=6) π = 3.14159... 3.464 circumscribed

Archimedes used 96-sided polygons to prove 3 + 10/71 < π < 3 + 1/7, giving 3.1408 < π < 3.1429. He never computed π, he trapped it. The method works because the circle's perimeter lies between the two polygon perimeters.

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Question
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Hasilkan digit pi
π has no final digit

Pi is irrational. Its decimal expansion never ends and never repeats. Every digit shown below is computed from the rumus leibniz.

π = 4(1 - 1/3 + 1/5 - 1/7 + ...)