+Pi (π) is a fundamental mathematical [constant](/wiki/constant) representing the ratio of a [circle's](/wiki/circle) [circumference](/wiki/circumference) to its [diameter](/wiki/diameter). This [irrational](/wiki/irrational) [number](/wiki/number) has a decimal expansion that continues infinitely without repetition, a core concept in [geometry](/wiki/geometry).
+## See also
+- [Circle](/wiki/circle)
+- [Constant](/wiki/constant)
+- [Number](/wiki/number)
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