### Formula

S

area

a

major radius or semimajor axis

b

minor radius or semiminor axis

S

area

a

major radius or semimajor axis

b

minor radius or semiminor axis

In geometry, an ellipse is a plane curve that results from the intersection of a cone by a plane in a way that produces a closed curve. Circles are special cases of ellipses, obtained when the cutting plane is orthogonal to the cone's axis.

a

b

S

Precision

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