Learn more: http://www.khanacademy.org/video?v=0A7RR0oy2ho
What are conic sections and why are they called "conic sections"?

Length: 9 minutes

Conic Sections: Intro to Circles

Length: 14 minutes

Conic Sections: Intro to Ellipses

Length: 13 minutes

Conic Sections: Intro to Hyperbolas