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Circumference facts for kids

Kids Encyclopedia Facts
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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
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Circumference Facts for Kids. Kiddle Encyclopedia.