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circumference
Circumference (from Latin ''circumferentia'', meaning "carrying around") is the linear distance around the edge of a closed curve or circular object. The circumference of a circle is of special importance in geometry and trigonometry. Informally "circumference" may also refer to the edge itself rather than to the length of the edge. Circumference is a special case of perimeter: the perimeter is the length around any closed figure, but conventionally "perimeter" is typically used in reference to a polygon while "circumference" typically refers to a continuously differentiable curve.
== Circumference of a circle ==
The circumference of a circle is the distance around it. The term is used when measuring physical objects, as well as when considering abstract geometric forms.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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