### Formula

a

major radius or semimajor axis

S

area

b

minor radius or semiminor axis

a

major radius or semimajor axis

S

area

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.

S

b

a

Precision

- C
- C#
- C++
- Java
- JavaScript
- LaTeX
- PHP