An animation that explains what my math teacher explained to me today about ellipses. The two points marked by small squares are called the "foci" of the elipse.<br><i>This is  smaller version of "<a href="https://en.wikipedia.org/wiki/en:Image:Ellipse_Animation.gif" class="extiw" title="w:en:Image:Ellipse Animation.gif">Image:Ellipse Animation.gif</a>".  Strangely, the file size is larger than the original.</i>
Created and uploaded by Michael Kossin (<a href="https://en.wikipedia.org/wiki/User:NoPetrol" class="extiw" title="w:User:NoPetrol">w:User:NoPetrol</a>)
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>, transferred from en.wikipedia