Pi
ratio of the circumference of a circle to its diameter / From Wikipedia, the free encyclopedia
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(π) (/paɪ/) is a mathematical constant that is the ratio of a circle's circumference to its diameter. This produces a number, and that number is always the same. However, the number is rather strange. The number starts as 3.141592653589793 and continues without end. Numbers like this are called irrational numbers.[1][2][3]
The diameter is the largest chord which can be fitted inside a circle. It passes through the center of the circle. The distance around a circle is known as the circumference. Even though the diameter and circumference are different for different circles, the number remains constant: its value never changes. This is because the relationship between the circumference and diameter is always the same.[4]