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If it's a circle, then it's pi*diameter or 2*pi*radius.

If it is an ellipse, the circumference (perimeter) is an infinite series with an approximation based on its eccentricity (which for a circle is zero).

(see the related link)

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12y ago
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12y ago

circumference = pi multiplied by the diameter

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Q: What is the formula to finding circumferences?
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