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Pehaps because perimeter is not a word they normally come across.
a circomference
It is the perimeter of a circle
The word perimeter means the distance around the outside of an object. The perimeter of a circle has a special name. We call it the circumference. The perimeter of this circle, or circumference, is 25 ft.
A perimeter is a path that surrounds an area. The word comes from the Greek peri (around) and meter(measure). The term may be used either for the path or its length - it can be thought of as the length of the outline of a shape. The perimeter of a circular area is called circumference.