Rachel
About
Khan Academy on a Stick
Conic Sections: Intro to Ellipses
Introduction to the ellipse.
Ellipses
Conic Sections: Intro to Ellipses
Foci of an Ellipse
Your browser does not support video. Please get the latest version of Google Chrome, Firefox, IE, or Safari. Alternately, you can try the link below if you have VLC or another media player installed.
If the above player doesn't work, you can
try this direct link
.