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# Ellipse Circumference Calculator

Calculate the circumference of an ellipse.

Ellipse Circumference Calculator

 Semi-major axis length (a):: Semi-minor axis length (b)::

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The Ellipse Circumference Calculator is used to calculate the approximate circumference of an ellipse.

## Ellipse

In geometry, an ellipse is a regular oval shape, traced by a point moving in a plane so that the sum of its distances from two other points (the foci) is constant, or resulting when a cone is cut by an oblique plane that does not intersect the base.

## Formula

There is no simple formula with high accuracy for calculating the circumference of an ellipse. The following is the approximate calculation formula for the circumference of an ellipse used in this calculator:

Where:
a = semi-major axis length of an ellipse
b = semi-minor axis length of an ellipse
π = 3.141592654

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