If 12.5 refers to the diameter, then the circumference is 39.3 units, approx.
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Expressed in terms of pi, it is 125π or if pi is assumed to be 3.1415, then 125 x 3.1415 is 392.6875 units.
The perimeter of a circle is its circumference
The round perimeter of circle is its circumference
The perimeter of a circle is its circumference
The distance around a circle is its circumference