10.1 Distance formula – where it comes from and how to use it

10.2 - Explanation of focus, directrix, parabola as locus of points (first 3 minutes only)

10.2 - watch this video and the next that comes on automatically

10.3 - graphing circles (first 4 minutes only)

10.4 writing the equation of an ellipse giving two points - start at 7:00