Assertion: ellipse's distance | /r/HasProperty | focus
Facets:
Source sentences:
text: An ellipse is a locus of a point which moves in such a way that its distance from a fixed point (focus) to its perpendicular distance from a fixed straight line (directrix) is constant.
text: and then I have this extra little flap where if I extend it out every single point if I draw this around the sum from the distance from one of these points which is called the focus and