Conic Analysis

In the applet below, a conic section is shown. Recall c = distance from center to either focus a = distance from center to either vertex

1.

How would you describe a conic that has c = 0?

2.

How would you describe a conic that has c < a ?

3.

How would you describe a conic that has c > a ?

4.

What happens when c = a ???