Why is the circumference alsways 3.14?

The circumference is not always 3.14 ,

The circumference of a circle is always (pi) times as long as the circle's diameter.

(Pi) is a number that can't be exactly written down with digits, that begins with 3.14 .

It's defined as the ratio of any circle's circumference to the same circle's diameter.

The reason is because that's one of the properties of the thing that we call a "circle".