Find out, moving the black point, which value should have the eccentricity "e" in order to get a parabola?
How must be inclined the section plane in order to get a parabola and how you can get a degenerate parabola? Write your thoughts.
How must be inclined the section plane in order to get an hyperbola ? Write your thoughts.
How must be inclined the section plane in order to get an ellipse and how you can get a degenerate ellipse? Write your thoughts.