Construct an Ellipse from it Focal Points and Height

[Acorn]

To understand this Challenge, you need to be aware of http://www.xara.com/templates/: the triangle made between the centre, the minor axis (top) apex and a focal point has its longest side the same length as from the centre to a major axis (side) apex.

Given a focal length and a height of both 400px, re-construct the ellipse.



Acorn