Circumference facts for kids
In geometry, circumference is the distance around a closed curve; for example, a circle. It is a special kind of perimeter.(c=PI x diameter)
Images for kids

When a circle's diameter is 1, its circumference is \pi.

When a circle's radius is 1—called a unit circle—its circumference is 2\pi.
See also
In Spanish: Circunferencia para niños
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Circumference Facts for Kids. Kiddle Encyclopedia.