Parabolas and circles.

1. Parabolas ...
everywhere you look ...
Talk-to-Me by flickr user photobrick

2. http://flickr.com/photos/kennethg/13430637/

3. What we learned from a piece of paper ...

4. What we learned from a piece of paper ...
by a similar argument we get ...

5. VERTICAL HORIZONTAL
Let's compare and contrast this with what we've learned before ...

6. Now you try: Sketch the graph, identify the vertex, focus, equation of the
axis of symmetry and the equation of the directrix.

7. And again: Sketch the graph, identify the vertex, focus, equation of the
axis of symmetry and the equation of the directrix.