Question

what is mean by circumference

Answer 1

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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. When a circle's diameter is 1, its circumference is π. When a circle's radius is 1—called a unit circle—its circumference is 2π.

Answer 2

Circumference is the total length of boundary of the circle.
In simplest way to understand, the perimeter of circle is called circumference