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If 12.5 refers to the diameter, then the circumference is 39.3 units, approx.
Assuming that "it" refers to diameter, the radius is 7 cm and the circumference is 44.0 cm.
The answer depends on what the "16 inch" refers to.
The answer depends on whether 5m refers to the radius or diameter.
Both are the measurement of the outside edge of a figure, circumference relates specifically to a circle, and perimeter refers to polygons.