Circumference

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Circumference typically refers to the distance around a circle, though it may refer to the distance around any closed curve like an ellipse, though calculating the circumference of an ellipse is moderately harder than calculating the circumference of a circle. The circumference of a circle is typically solved by $\pi \cdot d$ where $d$ represents a circle's diameter, though $\pi \cdot 2 r$ certainly works as well.


See also