The routine returns the length of the major axis of the given ellipse e.

The line segment through the foci and across the ellipse is called the major axis.

The command with(geometry,MajorAxis) allows the use of the abbreviated form of this command.

$\mathrm{with}\left(\mathrm{geometry}\right)\:$

$\mathrm{ellipse}\left(\mathrm{e1}\,2x^2+y^2-4x+4y=0\,\left[x\,y\right]\right)\:$

$\mathrm{MajorAxis}\left(\mathrm{e1}\right)$

$2\sqrt{6}$