3.142
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3.14 ( pi) is a mathematical constant whose value is the ratio of any circle's circumference to its diameter in Euclidean space
3.14
Circumference = pi*diameter where pi is a mathematical constant whose value is approx 3.1416 So, diameter = 4.1 cm means circumference = 12.88 cm
It is pi*d where d is the diameter of the circle. Since pi is a transcendental number, it is not possible to express its value exactly and so any value used for pi (3.14, 3.14159 or pi to 10 trillion digits) will still lead to an approximate answer.
The circumference of any circle divided by its diameter is equal to pi