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Circumference facts for kids

Kids Encyclopedia Facts
Circle-withsegments
Circumference (C in black) of a circle with diameter (D in cyan), radius (R in red), and centre (O in magenta). Circumference = π × diameter = 2 × π × radius.

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)

c = \pi * diameter



Images for kids

  • Pi-unrolled-720

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

  • 2pi-unrolled

    When a circle's radius is 1—called a unit circle—its circumference is 2\pi.

See also

Kids robot.svg In Spanish: Circunferencia para niños

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Circumference Facts for Kids. Kiddle Encyclopedia.