Pi is a mathematical constant that is the ratio of any circle's circumference to its diameter. It is approximately equal to 3.14 in the usual decimal representation. Because of the simplicity of its definition, it is regarded as the most mutual ground between mathematicians and non-mathematicians.

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The number is a mathematical constant, the ratio of a circle's circumference to its diameter, approximately equal to 3.14159. It has been represented by the Greek letter since the...